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American Journal of Epidemiology Vol. 131, No. 2: 373-375
Copyright © 1990 by The Johns Hopkins University School of Hygiene and Public Health

research-article

SIMPLE METHOD TO CALCULATE THE CONFIDENCE INTERVAL OF A STANDARDIZED MORTALITY RATIO (SMR)

K. ULM

Institute for Medical Statistics and Epidemiology, Technical University of Munich Ismaninger Strasse 22, 8000 München 80, Federal Republic of Germany

Send reprint requests to Dr. K. Ulm at this address

In analyzing standardized mortality ratios (SMRs), it is of interest to calculate a confidence interval for the true SMR. The exact limits of a specific interval can be obtained by means of the Poisson distribution either within an iterative procedure or by one of the tables. The limits can be approximated in using one of various shortcut methods. In this paper, a method is described for calculating the exact limits in a simple and easy way. The method is based on the link between the x2 distribution and the Poisson distribution. Only a table of the x2 distribution is necessary.

epidemiologic methods; statistics


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