Receiver operating characteristic curve of the new score was 0.721 (95% CI 0.714-0.727, p<0.001). In our population the score ranged from 0 to 54, and it was higher in the deceased group. The points assigned to each condition ranged from 0 to 16, and the possible range of the score varied between 0 and 89. We analyzed 75,586 admissions (53.4% females) and mean age was 72.7☑6.3years. Only predictors positively associated with IHM were taken into consideration and the Sullivan's method was applied in order to modify the parameter estimates of the regression model into an index. The EI was calculated for evaluation of comorbidity, then we added age, gender and diagnosis of ischemic heart disease. This single-center retrospective study included hospital admissions for any cause in the department of internal medicine between January 1, 2000, and December 31, 2013, recorded in the hospital database. Our aim was to obtain new measures based on internal medicine ICD codes for the original EI, to detect risk for IHM. The two most widely used scores for predicting IHM by International Classification of Diseases (ICD) codes are the Elixhauser (EI) and the Charlson Comorbidity indexes. In-hospital mortality (IHM) is an indicator of the quality of care provided.
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