a Number of hospital admissions after the index admission until readmission with schizophrenia (the outcome measure) or last date in the study file, whichever occurred first.
b Number of incident schizophrenia events in the cohort, with schizophrenia defined as ICD-9 codes 295.1, 295.2, 295.3, and 295.6.
c Mean time from the index admission to the last date in the study file.
d The exclusion criteria group is described in the Method section.