Background Over time, the situations encountered in case there is child mistreatment, could be very complex and, can result in methodological queries for the analysis of the info. considering the cluster dependency are accessible in statistical software program and highly suggested. Having a binary end result, usually coded 0/1, where 1 can be interpreted as the event of the event AZD0530 and 0 as the non-occurrence of event, the logistic regression model provides a simple and plausible way to estimate the probability of event of the event. By derivation, it is possible to demonstrate the exponential of the regression coefficient corresponds to the odds ratio, a popular measure to estimate the strength of the associations [12]. With this paper, the odds percentage will become then, the odds of mistreatment (vs. at risk of mistreatment) among the revealed group divided by the odds of it among the research group. Theoretically, the standard logistic regression model assumes that all the observations are self-employed [13]. Violations of the assumption of independence of observations may result in incorrect statistical inference due to biased standard errors [14, 15]. This model is the same as [M1] but the traditional standard errors are replaced by robust standard AZD0530 errors, which are also known as Huber and White colored (sandwich) standard errors. These powerful estimators allow for take account of the intracluster correlation, calming the assumption of independence of the observations. With this model, only the standard errors and the value are affected and the estimated coefficients are the same than those acquired by simple logistic regression [13]. Liang and Zeger [16] have proposed the generalized estimating equations as an extension of the generalized linear model to take into account the correlation between observations. A GEE model requires to designate (a) the link function to be used, (b) the distribution of the dependent variable, and (c) the operating correlation structure of the dependent variable among E2F1 the subjects of the clusters [11, 17C19]. When logit function is definitely chosen as the link function and when the binomial family is chosen to characterize the distribution of the dependent variable, the model corresponds to a logistic regression. Consequently, the exponential of the regression coefficient corresponds also to the odds ratio [11, 18, 20]. Nevertheless, because the computational algorithm of the estimators is different; estimated regression coefficients will typically be different from those obtained with a logistic regression model [7]. Regarding the choice of the correlation structure, an exchangeable correlation structure is often more appropriate for clustering at family level [17C19, 21] This exchangeable correlation structure assumed the same correlation for all pairs of subjects, reflecting average dependence among the observations in the same cluster. In our case, this should mean that the relation between the members of the same siblings is assumed to be equally correlated [11]. The GEE models, which use the model-based variance estimation, could lead to biased estimations of the standard errors in case of misspecification of the correlation structure. Therefore, the use of GEE models with robust standard errors, using the Huber and White (sandwich) estimator of variance, leads to produce valid standard errors even in the event of misspecification of the correlation structure [7, 14, 16, 17, 19]. In the results section, Table?3 presents, for the four modeling approaches: the odds ratio of the mistreatment among the six investigated factors, derived from the models, with their standard errors, their 95?% confidence intervals and the p value of the Walds tests. Finally, for taking into account the confounding ramifications of the looked into elements among them, the four versions had been began once again under a multivariable strategy; therefore, Table?4 presents the adjusted odds ratios, also with their standard errors, their 95?% AZD0530 confidence intervals and the p-value of the Walds tests. Table?3 Bivariate analysis of the associated factors according to the mistreatment status Table?4 Multivariable analysis of the associated factors according to the mistreatment status The significance level for all tests was 0.05 and all statistical analyses were performed using Stata/SE 12.0 for Windows (TX: StataCorp LP). Results and discussion Description.