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 x2 distribution and the Poisson distribution. Only a table of the x2 distribution is necessary.

Original languageEnglish
Pages (from-to)373-375
Number of pages3
JournalAmerican Journal of Epidemiology
Volume131
Issue number2
DOIs
StatePublished - Feb 1990

Keywords

  • Epidemiologic methods
  • Statistics

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