#CaseIndex stay identifier (index stay = eligible for a possible readmission)
#HospitalHospital identifier
#SiteLocation of the hospital
Year Year (most recent year in the SQLape_input.txt file, with at least 10% of records)
Risk-PD Risk groups, used to compute expected rates (labels in Excel table)
Complexity1) 1-3 diagnoses and operation in Categories.txt file
2) More than 3 categories in Categories.txt file
AgeClass0-45, 46-65, 66-75, 76-85, 85+ in years
PD1 Observed rate (= 1 if premature death, =0 if not)
PD0 Expected rate (see prediction models for more details, benchmark)