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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0065">Introduction</span><p id="par0005" class="elsevierStylePara elsevierViewall">Patients with systemic lupus erythematosus &#40;SLE&#41; have a higher incidence of a variety of secondary associated diseases than the general population&#46;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">1</span></a> These comorbid diseases arise from the SLE itself or because of the use of some medications to treat it&#46;<a class="elsevierStyleCrossRefs" href="#bib0070"><span class="elsevierStyleSup">2&#8211;4</span></a> A secondary disease associated with SLE is osteonecrosis &#40;ON&#41;&#44; whose prevalence varies widely&#44; from 4&#37; to 40&#37; in patients with lupus&#46;<a class="elsevierStyleCrossRefs" href="#bib0080"><span class="elsevierStyleSup">4&#44;5</span></a> ON is considered the main secondary disease that causes morbidity in patients with SLE&#46;<a class="elsevierStyleCrossRef" href="#bib0085"><span class="elsevierStyleSup">5</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">Several studies aimed to determine predictive factors of ON in patients with SLE<a class="elsevierStyleCrossRefs" href="#bib0070"><span class="elsevierStyleSup">2&#44;4&#44;6&#8211;10</span></a>&#59; however&#44; none have attempted to develop a predictive model&#44; which is the next step after determining the significant variables&#46; A predictive model is a tool that supports the decision-making of the providers to apply proper treatments considering the uniqueness of each patient&#46; The objective of this work is to develop a predictive model to determine if an individual suffering from SLE can also be diagnosed with ON using pharmacological&#44; demographic&#44; and psychoactive factors&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0070">Materials and Methods</span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0075">Data Collection</span><p id="par0015" class="elsevierStylePara elsevierViewall">The literature was reviewed to identify factors that are deemed to be related to the development of ON in SLE patients&#46; Data for the Chilean population was collected through an online survey&#44; which was developed based on findings from the literature&#44; health care providers&#44; survey development experts&#44; and individuals with SLE&#46; The effort resulted in an 89-question instrument distributed in four sections&#58; general information&#44; information about the SLE&#44; healthy lifestyle&#44; and information about the ON&#46; The survey was administered through a confidential online platform across Chile for a period of three weeks during December 2015&#46; Each participant was required to read and sign a form providing consent&#46; The process resulted in 46 de-identified records where 15&#46;22&#37; developed ON and 98&#46;21&#37; were women&#46;</p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0080">Development and Evaluation of a Predictive Model</span><p id="par0020" class="elsevierStylePara elsevierViewall">The de-identified data were used to create two models using a Bayesian logistic regression approach&#46; The response variable was the occurrence of the first ON &#40;1&#58; individual developed first ON&#44; 0&#58; individual did not develop ON&#41;&#46; The explanatory variables analyzed were mean consumption of corticosteroids per day &#40;mg&#41;&#44; cumulative consumption of corticosteroids &#40;mg&#41;&#44; tobacco use&#44; alcohol consumption&#44; age at first ON&#44; and race &#40;Mapuche&#8212;indigenous&#8212;origins or not&#41;&#46; Models were validated using leave-one-out cross-validation&#46; The first model used a non-informative prior multivariate normal distribution for the parameters&#8217; betas&#44; specifically&#44; &#946;i&#8764;N&#40;0&#44;10&#44;000&#41;&#44;&#8201;&#8202;&#8202;j&#61;0&#44;1&#44;&#8230;&#44;6&#46; The second model used a multivariate normal distribution&#44; mixing non-informative and informative prior normal distributions recently available in the literature &#40;<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#41;&#46; The priors were selected based on the significance of the variables in the studies &#40;&#945;&#61;0&#46;1&#41;&#58; mean consumption of corticosteroids per day&#44; with a <span class="elsevierStyleItalic">P</span>-value equal to &#46;0002&#59; tobacco use&#44; with a <span class="elsevierStyleItalic">P</span>-value equal to &#46;05&#59; and age at first ON&#44; with a <span class="elsevierStyleItalic">P</span>-value equal to &#46;08&#46;</p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia><p id="par0025" class="elsevierStylePara elsevierViewall">The likelihood contribution of each individual was binomial&#46; The posterior distribution was simulated using Markov chain Monte Carlo &#40;MCMC&#41; and the random walk metropolis &#40;RWM&#41; algorithm implemented in R software&#46; The total of iterations was 10&#44;000&#44;000 with a burn-in of 9&#44;000&#44;000 iterations&#46; The threshold was determined using the complete sample size through the receiver operating characteristic &#40;ROC&#41; curve&#44; maximizing the summation of the specificity and sensitivity&#46; The analysis of significance for the first and second models used 90&#37; and 95&#37; credible intervals &#40;CI&#41;&#44; respectively&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">The performances of the Bayesian models were compared to the non-parametric random decision forest model for accuracy&#44; sensitivity&#44; and specificity&#46; The optimal input variables were determined using the <span class="elsevierStyleItalic">tuneRF</span> function in R&#44; minimizing out-of-bag &#40;OOB&#41; errors&#46; The number of trees was determined screening from 1 to 1000 trees&#44; plotting the values against the OOB errors&#46; The random decision forest splits were performed using the Gini index&#46;</p></span></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0085">Results</span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0090">Bayesian Logistic Regression Models</span><p id="par0035" class="elsevierStylePara elsevierViewall">Using a non-informative prior distribution and a 95&#37; CI&#44; none of the variables seemed to be significant &#40;<a class="elsevierStyleCrossRef" href="#tbl0010">Table 2</a>&#41;&#46; With a 90&#37; CI&#44; the variables of mean consumption of corticosteroids per day and tobacco use were both significant&#46; Using prior information&#44; the same variables are significant with a 95&#37; CI&#46; These two variables were used to create the Bayesian logistic regression model&#46; <a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a> shows the ROC curve for the non-informative &#40;smooth line&#41; and informative &#40;dotted line&#41; Bayesian logistic regression models&#46; The threshold for the non-informative prior model was 0&#46;1819&#44; and the model for the informative prior was 0&#46;2187&#46; These values were used to validate the respective models&#46;</p><elsevierMultimedia ident="tbl0010"></elsevierMultimedia><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0040" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#tbl0015">Table 3</a> shows that the sensitivity&#44; specificity&#44; and accuracy were higher for the Bayesian logistic regression models with prior information than for the model with non-informative prior information&#46; The mean of the posterior distributions for the informative prior provides the estimators of the parameters&#46; The estimators&#44; considering the mean and the standard deviation &#40;mean&#177;SD&#41;&#44; are as follows&#58; intercept &#40;&#946;&#710;0&#41;&#8201;&#8202;&#8202;&#8722;3&#46;300&#177;0&#46;534&#44; mean of corticosteroids per day &#40;&#946;&#710;1&#41;&#8201;&#8202;&#8202;0&#46;048&#177;0&#46;009&#44; and tobacco use &#40;&#946;&#710;2&#41;&#8201;&#8202;&#8202;0&#46;562&#177;0&#46;238&#46;</p><elsevierMultimedia ident="tbl0015"></elsevierMultimedia></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0095">Random Decision Forest Model</span><p id="par0045" class="elsevierStylePara elsevierViewall">The random decision forest model used 85 trees and two input variables&#46; The accuracy of the random forest model &#40;0&#46;8478&#41; was higher than the Bayesian logistic regression model with prior information&#46; The sensitivity was the highest &#40;1&#46;0&#41;&#44; but the specificity was the lowest &#40;0&#46;0&#41;&#44; which means that the model was unable to predict the development of ON &#40;<a class="elsevierStyleCrossRef" href="#tbl0015">Table 3</a>&#41;&#46; The variable importance plot &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>&#41; displays that the mean corticosteroids per day led to the largest mean decrease in Gini impurity &#40;3&#46;7878&#41;&#46;</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia></span></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0100">Discussion</span><p id="par0050" class="elsevierStylePara elsevierViewall">Various studies have established that patients who receive high doses of corticosteroids are susceptible to developing ON in certain areas of the body&#46;<a class="elsevierStyleCrossRefs" href="#bib0070"><span class="elsevierStyleSup">2&#44;4&#44;6&#44;10&#44;11</span></a> Patients with SLE are administered high doses of corticosteroids in their therapies for long periods&#44; and therefore&#44; they are at risk of developing ON&#46; However&#44; there is uncertainty whether the cumulative doses and the duration of treatment with corticosteroids or the use of large doses of corticosteroids on a daily basis are the contributing factors to development of the disease&#46; Therefore&#44; it is not surprising that a variable related to corticosteroids is significant in the Bayesian models and influences the prediction power in random forest&#46; In addition&#44; it is not unusual that tobacco use was significant in the models because studies have related ON with non-corticosteroid factors such as tobacco use&#44; alcohol consumption&#44; age&#44; gender&#44; and race&#44; among others&#46;<a class="elsevierStyleCrossRefs" href="#bib0090"><span class="elsevierStyleSup">6&#44;7&#44;9</span></a></p><p id="par0055" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRefs" href="#fig0015">Figs&#46; 3 and 4</a> show the comparison of the posterior distributions for the parameters of the Bayesian models with prior and non-prior distribution&#46; <a class="elsevierStyleCrossRef" href="#fig0015">Fig&#46; 3</a> depicts the posterior distribution of the regression coefficient for mean corticosteroids per day&#44; and <a class="elsevierStyleCrossRef" href="#fig0020">Fig&#46; 4</a> shows the posterior distribution of the regression coefficient for tobacco use&#46; There is a significant reduction in the variance in the models with prior information&#46; The variance of the posterior distribution for mean corticosteroids per day decreased in 91&#37;&#44; and the mean decreased in 20&#37;&#46; The estimators of the variable mean corticosteroids per day for the model with prior distribution and the model without prior distribution are close&#46; This highlights the relevance of this factor&#46; A similar reduction occurred with the posterior distribution for tobacco use&#58; the variance decreased in 95&#46;2&#37;&#44; and the mean decreased in 68&#46;5&#37;&#46;</p><elsevierMultimedia ident="fig0015"></elsevierMultimedia><elsevierMultimedia ident="fig0020"></elsevierMultimedia><p id="par0060" class="elsevierStylePara elsevierViewall">With regard to the best performance model&#8212;Bayesian logistic regression model with prior information&#8212;the probability of developing ON&#44; &#952;i&#44; is calculated using Eq&#46; <a class="elsevierStyleCrossRef" href="#eq0005">&#40;1&#41;</a>&#44; where <span class="elsevierStyleItalic">i</span> is the individual&#46; Since the coefficient for mean corticosteroids per day and for tobacco use are positive&#44; the probability of developing ON will also increase if any of these variables increase&#46;<elsevierMultimedia ident="eq0005"></elsevierMultimedia></p><p id="par0070" class="elsevierStylePara elsevierViewall">Specifically&#44; if the explanatory variable&#44; mean corticosteroids per day&#44; increases by 1<span class="elsevierStyleHsp" style=""></span>mg&#44; and the variable tobacco use keeps constant&#44; the ratio between the probability that the individual develops ON and the probability that the individual does not develop ON increases by e0&#46;048&#8901;&#40;&#8776;1&#46;049&#41;&#46; Likewise&#44; if an individual consumes tobacco and the other variable is held constant&#44; the ratio increases in e0&#46;048&#8901;&#40;&#8776;1&#46;754&#41;&#46;</p><p id="par0075" class="elsevierStylePara elsevierViewall">The use of the preceding information is one of the main advantages of the Bayesian approach&#44; which is not possible with random forest and other methods&#46; In addition&#44; the estimators of the parameters calculated in this study provide prior information for future works in this matter&#46; Although random forest produces a higher accuracy than Bayesian logistic regression with prior information&#44; it is non-trivial to interpret and analyze&#44; and it seems to present problems when the sample size is small&#46; The Bayesian approach provides better interpretability and inferences&#46; In summary&#44; this work explores the opportunity of better supporting a provider&#39;s decision when treating individuals with lupus&#46; The use of this tool along with other outcome metrics&#44; specifically&#44; measurements of disease activity &#40;e&#46;g&#46;&#44; SLE diseases activity index &#8211; SLEDAI&#41; could further support the providers&#44; since a higher disease activity score appears associated with the incidence of ON in individuals with SLE&#46;<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">12</span></a></p><p id="par0080" class="elsevierStylePara elsevierViewall">This study has three main limitations&#46; First is the possibility of bias due to the auto report nature of the data because the data was extracted using a survey rather than clinical records&#46; Second&#44; the type and depth of clinical questions on the survey because the individuals responding are not able to address complicated clinical questions&#46; Third&#44; the sample size&#44; which does not allow for more in-depth training&#44; testing&#44; and validation&#46;</p></span><span id="sec0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0105">Conflicts of Interest</span><p id="par0085" class="elsevierStylePara elsevierViewall">The authors declare no conflicts of interest&#46;</p></span></span>"
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        "titulo" => "Abstract"
        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Objective</span><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">This work attempts to provide a model to predict the development of osteonecrosis &#40;ON&#41; in individuals with systemic lupus erythematosus &#40;SLE&#41; using pharmacological&#44; demographic&#44; and psychoactive factors&#46;</p></span> <span id="abst0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Method</span><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">A review of the literature was conducted to construct a survey administered across Chile to individuals with SLE during a period of three weeks&#46; This work used a sample size of 46 de-identified data records&#46; Two Bayesian logistic regression models were created&#44; with non-informative prior and informative prior distributions&#44; and a random forest model was done for comparison&#46; All models were cross-validated&#46;</p></span> <span id="abst0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0020">Results</span><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">The significant variables used were <span class="elsevierStyleItalic">mean corticosteroids per day</span> &#40;mg&#41; and <span class="elsevierStyleItalic">tobacco use</span>&#46; The random forest model provided good accuracy and sensitivity&#44; but low specificity&#46; Bayesian logistic regression with prior information increased the specificity&#46;</p></span> <span id="abst0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Conclusions</span><p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">This work determined that the use of corticosteroids and tobacco are significant variables to predict ON&#46; Using prior information provides good accuracy&#44; specificity&#44; and sensitivity to the prediction&#46; Further studies need to be conducted to validate the model using a testing set&#46;</p></span>"
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        "resumen" => "<span id="abst0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Objetivo</span><p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">Este trabajo busca determinar un modelo predictivo de desarrollo de osteonecrosis &#40;ON&#41; en individuos diagnosticados con lupus eritematoso sist&#233;mico &#40;LES&#41; utilizando factores farmacol&#243;gicos&#44; demogr&#225;ficos y psicoactivos&#46;</p></span> <span id="abst0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">M&#233;todo</span><p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">Se realiz&#243; una revisi&#243;n bibliogr&#225;fica para construir una encuesta&#44; la cual fue administrada a individuos con LES a lo largo de Chile durante un periodo de 3 semanas&#46; En este trabajo se utiliz&#243; una muestra de 46 registros de datos no identificados&#46; Se desarrollaron 2 modelos de regresi&#243;n log&#237;stica bayesiana con informaci&#243;n <span class="elsevierStyleItalic">a priori</span> no informativa e informativa&#44; y tambi&#233;n se desarroll&#243; un modelo comparativo utilizando bosques aleatorios&#46; Los modelos fueron validados usando validaci&#243;n cruzada&#46;</p></span> <span id="abst0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Resultados</span><p id="spar0035" class="elsevierStyleSimplePara elsevierViewall">Se usaron las variables significativas promedio de corticosteroides por d&#237;a &#40;mg&#41; y consumo de tabaco&#46; Bosques aleatorios provee una precisi&#243;n y sensibilidad alta&#44; pero una baja especificidad&#46; La regresi&#243;n log&#237;stica bayesiana con informaci&#243;n <span class="elsevierStyleItalic">a priori</span> increment&#243; el valor de la especificidad&#46;</p></span> <span id="abst0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">Conclusiones</span><p id="spar0040" class="elsevierStyleSimplePara elsevierViewall">Este trabajo ha determinado que el uso de corticosteroides y tabaco son variables significativas para predecir ON&#46; Usando informaci&#243;n <span class="elsevierStyleItalic">a priori</span> arroja buenos resultados en precisi&#243;n&#44; especificidad y sensibilidad en la predicci&#243;n&#46; Se requieren realizar m&#225;s estudios aumentando el tama&#241;o de la muestra para validar el modelo usando un conjunto de prueba&#46;</p></span>"
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                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Variables&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">1&#46;05 &#91;1&#46;02&#44; 1&#46;07&#93;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">Gladman &#40;2017&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&#8211;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Non-informative prior</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " colspan="2" align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Informative prior</th></tr><tr title="table-row"><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">90&#37; CI&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">95&#37; CI&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">90&#37; CI&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="\n
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                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">95&#37; CI&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Mean consumption of corticoids per day &#40;mg&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#91;&#8722;0&#46;0093&#44; 0&#46;1258&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#91;0&#46;0325&#44; 0&#46;0625&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#91;0&#46;0296&#44; 0&#46;0654&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t">Cumulative consumption of corticoids &#40;mg&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#91;&#8722;0&#46;0000&#44; 0&#46;0000&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#91;&#8722;0&#46;0000&#44; 0&#46;0000&#93;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#91;0&#46;0000&#44; 0&#46;0000&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#91;0&#46;0000&#44; 0&#46;0000&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Tobacco use&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#91;&#8722;0&#46;0828&#44; 4&#46;7780&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#91;0&#46;1848&#44; 0&#46;9716&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#91;0&#46;1086&#44; 1&#46;0460&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
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                  \t\t\t\t">Alcohol consumption&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
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                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#91;&#8722;2&#46;3742&#44; 1&#46;0969&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#91;&#8722;2&#46;7870&#44; 1&#46;4020&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
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                  \t\t\t\t">Age at first ON &#40;years&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#91;&#8722;0&#46;1280&#44; 0&#46;0704&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#91;&#8722;0&#46;1498&#44; 0&#46;0892&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#91;&#8722;0&#46;1096&#44; 0&#46;0118&#93;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#91;&#8722;0&#46;1220&#44; 0&#46;0227&#93;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#91;&#8722;3&#46;9850&#44; 2&#46;1930&#93;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#91;&#8722;3&#46;2140&#44; 1&#46;6673&#93;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#91;&#8722;3&#46;9290&#44; 2&#46;0330&#93;&nbsp;\t\t\t\t\t\t\n
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                  <table border="0" frame="\n
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                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t">Sensitivity&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">0&#46;7949&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">0&#46;8974&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Specificity&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;2857&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">0&#46;0000&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">0&#46;4286&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr></tbody></table>
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                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Comorbilidad en lupus eritematoso sist&#233;mico"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
                          "autores" => array:2 [
                            0 => "E&#46; &#218;car Angulo"
                            1 => "N&#46; Rivera Garc&#237;a"
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                    0 => array:1 [
                      "Revista" => array:6 [
                        "tituloSerie" => "Reumatol Cl&#237;nica"
                        "fecha" => "2008"
                        "volumen" => "4"
                        "paginaInicial" => "17"
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                    0 => array:2 [
                      "titulo" => "High-dose intravenous methylprednisolone therapy associated with osteonecrosis in patients with systemic lupus erythematosus"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
                          "autores" => array:6 [
                            0 => "L&#46; Massardo"
                            1 => "S&#46; Jacobelli"
                            2 => "M&#46; Leissner"
                            3 => "M&#46; Gonz"
                            4 => "L&#46; Villarroel"
                            5 => "S&#46; Rivero"
                          ]
                        ]
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                    0 => array:2 [
                      "doi" => "10.1177/096120339200100610"
                      "Revista" => array:6 [
                        "tituloSerie" => "Lupus"
                        "fecha" => "1992"
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Original Article
Osteonecrosis in individuals with systemic lupus erythematosus: A predictive model
Osteonecrosis en individuos con lupus eritematoso sistémico: un modelo predictivo
Jennifer Mendoza-Alonzoa,
Autor para correspondencia
jennifermend@mail.usf.edu

Corresponding author.
, José Zayas-Castroa, Karina Soto-Sandovalb
a Department of Industrial and Management Systems Engineering, University of South Florida, 4202 E. Fowler Avenue, Tampa, FL 33620, USA
b Departamento de Gobierno y Empresa, Universidad de Los Lagos, Campus Puerto Montt, Chinquihue km 6, Chile
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        "titulo" => "Osteonecrosis en individuos con lupus eritematoso sist&#233;mico&#58; un modelo predictivo"
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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0065">Introduction</span><p id="par0005" class="elsevierStylePara elsevierViewall">Patients with systemic lupus erythematosus &#40;SLE&#41; have a higher incidence of a variety of secondary associated diseases than the general population&#46;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">1</span></a> These comorbid diseases arise from the SLE itself or because of the use of some medications to treat it&#46;<a class="elsevierStyleCrossRefs" href="#bib0070"><span class="elsevierStyleSup">2&#8211;4</span></a> A secondary disease associated with SLE is osteonecrosis &#40;ON&#41;&#44; whose prevalence varies widely&#44; from 4&#37; to 40&#37; in patients with lupus&#46;<a class="elsevierStyleCrossRefs" href="#bib0080"><span class="elsevierStyleSup">4&#44;5</span></a> ON is considered the main secondary disease that causes morbidity in patients with SLE&#46;<a class="elsevierStyleCrossRef" href="#bib0085"><span class="elsevierStyleSup">5</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">Several studies aimed to determine predictive factors of ON in patients with SLE<a class="elsevierStyleCrossRefs" href="#bib0070"><span class="elsevierStyleSup">2&#44;4&#44;6&#8211;10</span></a>&#59; however&#44; none have attempted to develop a predictive model&#44; which is the next step after determining the significant variables&#46; A predictive model is a tool that supports the decision-making of the providers to apply proper treatments considering the uniqueness of each patient&#46; The objective of this work is to develop a predictive model to determine if an individual suffering from SLE can also be diagnosed with ON using pharmacological&#44; demographic&#44; and psychoactive factors&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0070">Materials and Methods</span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0075">Data Collection</span><p id="par0015" class="elsevierStylePara elsevierViewall">The literature was reviewed to identify factors that are deemed to be related to the development of ON in SLE patients&#46; Data for the Chilean population was collected through an online survey&#44; which was developed based on findings from the literature&#44; health care providers&#44; survey development experts&#44; and individuals with SLE&#46; The effort resulted in an 89-question instrument distributed in four sections&#58; general information&#44; information about the SLE&#44; healthy lifestyle&#44; and information about the ON&#46; The survey was administered through a confidential online platform across Chile for a period of three weeks during December 2015&#46; Each participant was required to read and sign a form providing consent&#46; The process resulted in 46 de-identified records where 15&#46;22&#37; developed ON and 98&#46;21&#37; were women&#46;</p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0080">Development and Evaluation of a Predictive Model</span><p id="par0020" class="elsevierStylePara elsevierViewall">The de-identified data were used to create two models using a Bayesian logistic regression approach&#46; The response variable was the occurrence of the first ON &#40;1&#58; individual developed first ON&#44; 0&#58; individual did not develop ON&#41;&#46; The explanatory variables analyzed were mean consumption of corticosteroids per day &#40;mg&#41;&#44; cumulative consumption of corticosteroids &#40;mg&#41;&#44; tobacco use&#44; alcohol consumption&#44; age at first ON&#44; and race &#40;Mapuche&#8212;indigenous&#8212;origins or not&#41;&#46; Models were validated using leave-one-out cross-validation&#46; The first model used a non-informative prior multivariate normal distribution for the parameters&#8217; betas&#44; specifically&#44; &#946;i&#8764;N&#40;0&#44;10&#44;000&#41;&#44;&#8201;&#8202;&#8202;j&#61;0&#44;1&#44;&#8230;&#44;6&#46; The second model used a multivariate normal distribution&#44; mixing non-informative and informative prior normal distributions recently available in the literature &#40;<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#41;&#46; The priors were selected based on the significance of the variables in the studies &#40;&#945;&#61;0&#46;1&#41;&#58; mean consumption of corticosteroids per day&#44; with a <span class="elsevierStyleItalic">P</span>-value equal to &#46;0002&#59; tobacco use&#44; with a <span class="elsevierStyleItalic">P</span>-value equal to &#46;05&#59; and age at first ON&#44; with a <span class="elsevierStyleItalic">P</span>-value equal to &#46;08&#46;</p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia><p id="par0025" class="elsevierStylePara elsevierViewall">The likelihood contribution of each individual was binomial&#46; The posterior distribution was simulated using Markov chain Monte Carlo &#40;MCMC&#41; and the random walk metropolis &#40;RWM&#41; algorithm implemented in R software&#46; The total of iterations was 10&#44;000&#44;000 with a burn-in of 9&#44;000&#44;000 iterations&#46; The threshold was determined using the complete sample size through the receiver operating characteristic &#40;ROC&#41; curve&#44; maximizing the summation of the specificity and sensitivity&#46; The analysis of significance for the first and second models used 90&#37; and 95&#37; credible intervals &#40;CI&#41;&#44; respectively&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">The performances of the Bayesian models were compared to the non-parametric random decision forest model for accuracy&#44; sensitivity&#44; and specificity&#46; The optimal input variables were determined using the <span class="elsevierStyleItalic">tuneRF</span> function in R&#44; minimizing out-of-bag &#40;OOB&#41; errors&#46; The number of trees was determined screening from 1 to 1000 trees&#44; plotting the values against the OOB errors&#46; The random decision forest splits were performed using the Gini index&#46;</p></span></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0085">Results</span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0090">Bayesian Logistic Regression Models</span><p id="par0035" class="elsevierStylePara elsevierViewall">Using a non-informative prior distribution and a 95&#37; CI&#44; none of the variables seemed to be significant &#40;<a class="elsevierStyleCrossRef" href="#tbl0010">Table 2</a>&#41;&#46; With a 90&#37; CI&#44; the variables of mean consumption of corticosteroids per day and tobacco use were both significant&#46; Using prior information&#44; the same variables are significant with a 95&#37; CI&#46; These two variables were used to create the Bayesian logistic regression model&#46; <a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a> shows the ROC curve for the non-informative &#40;smooth line&#41; and informative &#40;dotted line&#41; Bayesian logistic regression models&#46; The threshold for the non-informative prior model was 0&#46;1819&#44; and the model for the informative prior was 0&#46;2187&#46; These values were used to validate the respective models&#46;</p><elsevierMultimedia ident="tbl0010"></elsevierMultimedia><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0040" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#tbl0015">Table 3</a> shows that the sensitivity&#44; specificity&#44; and accuracy were higher for the Bayesian logistic regression models with prior information than for the model with non-informative prior information&#46; The mean of the posterior distributions for the informative prior provides the estimators of the parameters&#46; The estimators&#44; considering the mean and the standard deviation &#40;mean&#177;SD&#41;&#44; are as follows&#58; intercept &#40;&#946;&#710;0&#41;&#8201;&#8202;&#8202;&#8722;3&#46;300&#177;0&#46;534&#44; mean of corticosteroids per day &#40;&#946;&#710;1&#41;&#8201;&#8202;&#8202;0&#46;048&#177;0&#46;009&#44; and tobacco use &#40;&#946;&#710;2&#41;&#8201;&#8202;&#8202;0&#46;562&#177;0&#46;238&#46;</p><elsevierMultimedia ident="tbl0015"></elsevierMultimedia></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0095">Random Decision Forest Model</span><p id="par0045" class="elsevierStylePara elsevierViewall">The random decision forest model used 85 trees and two input variables&#46; The accuracy of the random forest model &#40;0&#46;8478&#41; was higher than the Bayesian logistic regression model with prior information&#46; The sensitivity was the highest &#40;1&#46;0&#41;&#44; but the specificity was the lowest &#40;0&#46;0&#41;&#44; which means that the model was unable to predict the development of ON &#40;<a class="elsevierStyleCrossRef" href="#tbl0015">Table 3</a>&#41;&#46; The variable importance plot &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>&#41; displays that the mean corticosteroids per day led to the largest mean decrease in Gini impurity &#40;3&#46;7878&#41;&#46;</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia></span></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0100">Discussion</span><p id="par0050" class="elsevierStylePara elsevierViewall">Various studies have established that patients who receive high doses of corticosteroids are susceptible to developing ON in certain areas of the body&#46;<a class="elsevierStyleCrossRefs" href="#bib0070"><span class="elsevierStyleSup">2&#44;4&#44;6&#44;10&#44;11</span></a> Patients with SLE are administered high doses of corticosteroids in their therapies for long periods&#44; and therefore&#44; they are at risk of developing ON&#46; However&#44; there is uncertainty whether the cumulative doses and the duration of treatment with corticosteroids or the use of large doses of corticosteroids on a daily basis are the contributing factors to development of the disease&#46; Therefore&#44; it is not surprising that a variable related to corticosteroids is significant in the Bayesian models and influences the prediction power in random forest&#46; In addition&#44; it is not unusual that tobacco use was significant in the models because studies have related ON with non-corticosteroid factors such as tobacco use&#44; alcohol consumption&#44; age&#44; gender&#44; and race&#44; among others&#46;<a class="elsevierStyleCrossRefs" href="#bib0090"><span class="elsevierStyleSup">6&#44;7&#44;9</span></a></p><p id="par0055" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRefs" href="#fig0015">Figs&#46; 3 and 4</a> show the comparison of the posterior distributions for the parameters of the Bayesian models with prior and non-prior distribution&#46; <a class="elsevierStyleCrossRef" href="#fig0015">Fig&#46; 3</a> depicts the posterior distribution of the regression coefficient for mean corticosteroids per day&#44; and <a class="elsevierStyleCrossRef" href="#fig0020">Fig&#46; 4</a> shows the posterior distribution of the regression coefficient for tobacco use&#46; There is a significant reduction in the variance in the models with prior information&#46; The variance of the posterior distribution for mean corticosteroids per day decreased in 91&#37;&#44; and the mean decreased in 20&#37;&#46; The estimators of the variable mean corticosteroids per day for the model with prior distribution and the model without prior distribution are close&#46; This highlights the relevance of this factor&#46; A similar reduction occurred with the posterior distribution for tobacco use&#58; the variance decreased in 95&#46;2&#37;&#44; and the mean decreased in 68&#46;5&#37;&#46;</p><elsevierMultimedia ident="fig0015"></elsevierMultimedia><elsevierMultimedia ident="fig0020"></elsevierMultimedia><p id="par0060" class="elsevierStylePara elsevierViewall">With regard to the best performance model&#8212;Bayesian logistic regression model with prior information&#8212;the probability of developing ON&#44; &#952;i&#44; is calculated using Eq&#46; <a class="elsevierStyleCrossRef" href="#eq0005">&#40;1&#41;</a>&#44; where <span class="elsevierStyleItalic">i</span> is the individual&#46; Since the coefficient for mean corticosteroids per day and for tobacco use are positive&#44; the probability of developing ON will also increase if any of these variables increase&#46;<elsevierMultimedia ident="eq0005"></elsevierMultimedia></p><p id="par0070" class="elsevierStylePara elsevierViewall">Specifically&#44; if the explanatory variable&#44; mean corticosteroids per day&#44; increases by 1<span class="elsevierStyleHsp" style=""></span>mg&#44; and the variable tobacco use keeps constant&#44; the ratio between the probability that the individual develops ON and the probability that the individual does not develop ON increases by e0&#46;048&#8901;&#40;&#8776;1&#46;049&#41;&#46; Likewise&#44; if an individual consumes tobacco and the other variable is held constant&#44; the ratio increases in e0&#46;048&#8901;&#40;&#8776;1&#46;754&#41;&#46;</p><p id="par0075" class="elsevierStylePara elsevierViewall">The use of the preceding information is one of the main advantages of the Bayesian approach&#44; which is not possible with random forest and other methods&#46; In addition&#44; the estimators of the parameters calculated in this study provide prior information for future works in this matter&#46; Although random forest produces a higher accuracy than Bayesian logistic regression with prior information&#44; it is non-trivial to interpret and analyze&#44; and it seems to present problems when the sample size is small&#46; The Bayesian approach provides better interpretability and inferences&#46; In summary&#44; this work explores the opportunity of better supporting a provider&#39;s decision when treating individuals with lupus&#46; The use of this tool along with other outcome metrics&#44; specifically&#44; measurements of disease activity &#40;e&#46;g&#46;&#44; SLE diseases activity index &#8211; SLEDAI&#41; could further support the providers&#44; since a higher disease activity score appears associated with the incidence of ON in individuals with SLE&#46;<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">12</span></a></p><p id="par0080" class="elsevierStylePara elsevierViewall">This study has three main limitations&#46; First is the possibility of bias due to the auto report nature of the data because the data was extracted using a survey rather than clinical records&#46; Second&#44; the type and depth of clinical questions on the survey because the individuals responding are not able to address complicated clinical questions&#46; Third&#44; the sample size&#44; which does not allow for more in-depth training&#44; testing&#44; and validation&#46;</p></span><span id="sec0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0105">Conflicts of Interest</span><p id="par0085" class="elsevierStylePara elsevierViewall">The authors declare no conflicts of interest&#46;</p></span></span>"
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        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Objective</span><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">This work attempts to provide a model to predict the development of osteonecrosis &#40;ON&#41; in individuals with systemic lupus erythematosus &#40;SLE&#41; using pharmacological&#44; demographic&#44; and psychoactive factors&#46;</p></span> <span id="abst0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Method</span><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">A review of the literature was conducted to construct a survey administered across Chile to individuals with SLE during a period of three weeks&#46; This work used a sample size of 46 de-identified data records&#46; Two Bayesian logistic regression models were created&#44; with non-informative prior and informative prior distributions&#44; and a random forest model was done for comparison&#46; All models were cross-validated&#46;</p></span> <span id="abst0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0020">Results</span><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">The significant variables used were <span class="elsevierStyleItalic">mean corticosteroids per day</span> &#40;mg&#41; and <span class="elsevierStyleItalic">tobacco use</span>&#46; The random forest model provided good accuracy and sensitivity&#44; but low specificity&#46; Bayesian logistic regression with prior information increased the specificity&#46;</p></span> <span id="abst0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Conclusions</span><p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">This work determined that the use of corticosteroids and tobacco are significant variables to predict ON&#46; Using prior information provides good accuracy&#44; specificity&#44; and sensitivity to the prediction&#46; Further studies need to be conducted to validate the model using a testing set&#46;</p></span>"
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        "resumen" => "<span id="abst0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Objetivo</span><p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">Este trabajo busca determinar un modelo predictivo de desarrollo de osteonecrosis &#40;ON&#41; en individuos diagnosticados con lupus eritematoso sist&#233;mico &#40;LES&#41; utilizando factores farmacol&#243;gicos&#44; demogr&#225;ficos y psicoactivos&#46;</p></span> <span id="abst0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">M&#233;todo</span><p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">Se realiz&#243; una revisi&#243;n bibliogr&#225;fica para construir una encuesta&#44; la cual fue administrada a individuos con LES a lo largo de Chile durante un periodo de 3 semanas&#46; En este trabajo se utiliz&#243; una muestra de 46 registros de datos no identificados&#46; Se desarrollaron 2 modelos de regresi&#243;n log&#237;stica bayesiana con informaci&#243;n <span class="elsevierStyleItalic">a priori</span> no informativa e informativa&#44; y tambi&#233;n se desarroll&#243; un modelo comparativo utilizando bosques aleatorios&#46; Los modelos fueron validados usando validaci&#243;n cruzada&#46;</p></span> <span id="abst0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Resultados</span><p id="spar0035" class="elsevierStyleSimplePara elsevierViewall">Se usaron las variables significativas promedio de corticosteroides por d&#237;a &#40;mg&#41; y consumo de tabaco&#46; Bosques aleatorios provee una precisi&#243;n y sensibilidad alta&#44; pero una baja especificidad&#46; La regresi&#243;n log&#237;stica bayesiana con informaci&#243;n <span class="elsevierStyleItalic">a priori</span> increment&#243; el valor de la especificidad&#46;</p></span> <span id="abst0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">Conclusiones</span><p id="spar0040" class="elsevierStyleSimplePara elsevierViewall">Este trabajo ha determinado que el uso de corticosteroides y tabaco son variables significativas para predecir ON&#46; Usando informaci&#243;n <span class="elsevierStyleItalic">a priori</span> arroja buenos resultados en precisi&#243;n&#44; especificidad y sensibilidad en la predicci&#243;n&#46; Se requieren realizar m&#225;s estudios aumentando el tama&#241;o de la muestra para validar el modelo usando un conjunto de prueba&#46;</p></span>"
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                  <table border="0" frame="\n
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                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Variables&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">OR &#91;95&#37; CI&#93;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Prior&#8201;&#8202;&#8202;N&#40;&#956;&#44;&#963;2&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-head\n
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                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Source&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">Mean consumption of corticoids per day &#40;mg&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">1&#46;05 &#91;1&#46;02&#44; 1&#46;07&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">N&#40;log1&#46;05&#44;0&#46;000093&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Gladman &#40;2017&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Cumulative consumption of corticoids &#40;mg&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">N&#40;0&#44;10&#44;000&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
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                  \t\t\t\t">Tobacco use&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">1&#46;64 &#91;1&#46;01&#44; 2&#46;65&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">N&#40;log1&#46;64&#44;0&#46;0023&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Wang &#40;2016&#41;<a class="elsevierStyleCrossRef" href="#bib0105"><span class="elsevierStyleSup">9</span></a>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Alcohol consumption&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">N&#40;0&#44;10&#44;000&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
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                  \t\t\t\t">Age at first ON &#40;years&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">0&#46;92 &#91;0&#46;84&#44; 1&#46;01&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">N&#40;log0&#46;92&#44;0&#46;0023&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">Gladman &#40;2017&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
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                  \t\t\t\t">Race&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">N&#40;0&#44;10&#44;000&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#8211;&nbsp;\t\t\t\t\t\t\n
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                  <table border="0" frame="\n
                  \t\t\t\t\tvoid\n
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                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
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                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " colspan="2" align="center" valign="\n
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                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="\n
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                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="\n
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                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">95&#37; CI&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="\n
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                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">90&#37; CI&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">95&#37; CI&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td-with-role" title="\n
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                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Mean consumption of corticoids per day &#40;mg&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#91;0&#46;0004&#44; 0&#46;1129&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#91;&#8722;0&#46;0093&#44; 0&#46;1258&#93;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#91;0&#46;0325&#44; 0&#46;0625&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#91;0&#46;0296&#44; 0&#46;0654&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Cumulative consumption of corticoids &#40;mg&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#91;&#8722;0&#46;0000&#44; 0&#46;0000&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t">&#91;&#8722;0&#46;0000&#44; 0&#46;0000&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#91;0&#46;0000&#44; 0&#46;0000&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#91;0&#46;0000&#44; 0&#46;0000&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Tobacco use&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#91;0&#46;2837&#44; 4&#46;3183&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#91;&#8722;0&#46;0828&#44; 4&#46;7780&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#91;0&#46;1848&#44; 0&#46;9716&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#91;0&#46;1086&#44; 1&#46;0460&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Alcohol consumption&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#91;&#8722;3&#46;0076&#44; 1&#46;0271&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#91;&#8722;0&#46;0034&#44; 1&#46;3970&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#91;&#8722;2&#46;3742&#44; 1&#46;0969&#93;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
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Información del artículo
ISSN: 1699258X
Idioma original: Inglés
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