title: A SAS program for evaluating person-years of risk in cohort studies.
abstract: A SAS macro, written to evaluate person-years of exposure in longitudinal studies, is presented in this paper. The program has the advantage of stratification by age groups and chronological subperiods, a feature recommended in long-term studies, involving temporal changes in patterns of outcome. The program creates a data set that can be utilized to calculate age-adjusted incidence rates in categories of risk factors for morbidity and mortality.
authors.affiliation: Computing Center, Bar-Ilan University, Ramat Gan, Israel.
authors.forename: S
authors.initials: S
authors.lastname: Yaari
authors.forename: U
authors.initials: U
authors.lastname: Goldbourt
mesh_terms: D015331:Cohort Studies; D003199:Computer Systems; D004812:Epidemiologic Methods; D005500:Follow-Up Studies; D006801:Humans; D012984:Software