A case-control study of risk factors for ectopic pregnancy using routinely collected administrative data.

James Charles. Hockin
The potential for using the case-control design with only hospital separation records was explored in a study of ectopic pregnancy. The Saskatchewan Hospital Services Commission hospital morbidity database was used. Cases were women hospitalized for ectopic pregnancy in the years 1984 through 1986. Controls were women hospitalized for any other pregnancy condition. In a case-control study using pregnant controls, the odds ratio is an appropriate estimator of relative risk, conditional on conception. Among the potential...
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