A simple method to calculate the confidence interval of a standardized mortality ratio (SMR)

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Abstract

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 chi 2 distribution and the Poisson distribution. Only a table of the chi 2 distribution is necessary.

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Journal

Journal ID (iso-abbrev): Am J Epidemiol

Title: American journal of epidemiology

Publisher: Oxford University Press (OUP)

ISSN: 0002-9262

ISSN (Print): 0002-9262

Publication date (Electronic): Feb 1990

Volume: 131

Issue: 2

Affiliations

[1 ] Institute for Medical Statistics and Epidemiology, Technical University of Munich, Federal Republic of Germany.

Article

DOI: 10.1093/oxfordjournals.aje.a115507

PubMed ID: 2296988

SO-VID: 5df19823-0f41-4783-9dce-de7bd00bb48b

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