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October 12, 1994

Oral Contraceptives and Complications From Diabetes

Author Affiliations

University of Alabama Birmingham

JAMA. 1994;272(14):1104. doi:10.1001/jama.1994.03520140034032

To the Editor.  —The study reported by Dr Garg and colleagues1 is not a retrospective case-control study. It is a retrospective cohort study. In a case-control study, the investigators select on presence or absence of disease, not presence or absence of exposure, as was done in this case.This letter was shown to Dr Garg, who declined to reply.—Ed.