© 1986 Oxford University Press
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Cohort Study Analysis with a FORTRAN Computer Program

*Imperial Cancer Research Fund, Cancer Epidemiology and Clinical Trials Unit Gibson Building, Radcliffe Infirmary, Oxford OX2 6HE, UK
* *Dept of Epidemiology, London School of Hygiene & Tropical Medicine Keppel Street, London WC1E 7HT, UK
Institute of Cancer Research, Division of Epidemiology Block D, Clifton Avenue, Sutton, Surrey SM2 5PX, UK
We describe the analysis of cohort study data with a standard FORTRAN program which should run on most computers. It provides a summary measure of the mortality (or incidence) rate ratio between the study cohort and some standard population, based either on person-years at risk or on proportional mortality, and adjusted for age, sex and calendar period; a test of the statistical significance of the ratio; and a set of observed death rates in the study cohort. Results may also be produced in a form suitable for use with GLIM. The analysis may be subdivided into a range of time intervals since each subject was first exposed to risk. The program provides for movement of subjects between different level-of-exposure subgroups within the cohort, and for various methods of censoring. It allows considerable flexibility in data management, and is available with complete documentation and a worked example. The program should enable epidemiologists with little computing experience to carry out formal analysis of cohort studies.
Received 1 June 1985
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