 In a recent study, which included 845 patients that at the time of ICU discharge had at least one risk factor for readmission, the investigators group developed a new readmission risk score in the ICU, Safe Discharge from ICU SD-ICU, using parameters easily and routinely measured in ICU: the Charlson comorbidity ICC, the TISS-28 Therapeutic Intervention Scoring System - 28, the length of stay in ICU and age. Through ROC curve analysis, the investigators found that patients with a score above 14.5 had a high probability of readmission. 