We will use the SRR-30D and SRR-24H that we derive in the derivation sample to calculate ICISS-30D and ICISS-24H in the validation sample. We will then assess the performance of ICISS-30D in predicting mortality within 30 days and within 24 hours, and the performance of ICISS-24H in predicting mortality within 30 days and within 24 hours. Finally, the performance of each model in the validation sample will be compared with the same model's performance in the derivation sample.