METHODS: This was a retrospective study of patients who died within 24 hours of admission to a medical or surgical ICU at a tertiary care medical center over a period of one year June 2014 to May 2015. Primary outcome was mortality during the first 24 hours following ICU admission. Variables examined included patient demographics, modified SOFA score, baseline ECOG score, Code status/ CPR and selected laboratory values. All patients were managed by an in-house ICU team and a critical care attending physician on-site during day and available by phone overnight. Of particular interest was the time of admission (admission times were sorted into three groups, 8am to 4pm, 4pm to 12am and 12am to 8am based on shift change timings) and weekend vs non weekend admission.