 All adult patients discharged from a 37 bed general ICU from April 2014 to March 2015 will be included in the study. The SD-ICU score is routinely calculated at the time of discharge from the ICU. Patients will be divided into two groups: those with SD-ICU score 14.5 group 1 and those with a score equal to or less than 14.5 group 2. The two groups will be compared with respect to the frequency of unplanned readmissions. Stepwise, multivariate logistic regression will be used to investigate the association between the risk factors for readmission used in SD-ICU score and ICU readmission as outcome. 