The authors estimate the survival probability of each risk group according to the Kaplan-Meier method and compared these curves using the Log-Rank test. It will be used ROC curves i the AUC to assess the ability of the index ICH to perform properly the assignment of patients to different risk groups. The hazard ratio according to the proportional hazards model categorized in their levels of risk, in order to observe the increase in the risk of death that occurs from a risk group to the next. The statistical analysis consisted of a multivariate logistic regression model. The model selection has been caried out with an AIC-led forward step selection method. To ensure internal validity, 20% of data has been discarded in the phase of constructing the model and only used to assess model performance using ROC curves and the AUC.