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This is a longitudinal score based on 12 months of patient data; the higher the score, the greater the mortality risk due to comorbid illness. We did not include diagnoses as predictors because we found that we could not capture them reliably in real time. Using this structure, we could assign patients an hourly score, permitting us to also predict multiple events per patient.

We kept the highest, lowest and most deranged ( Appendix B ) vital sign recorded in the past 24 h; for laboratory tests, we took the most recent value in the past 72 h.