American Journal of Epidemiology Vol. 136, No. 1: 35-45
Copyright © 1992 by The Johns Hopkins University School of Hygiene and Public Health
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Fatal Stroke and Use of Oral Contraceptives: Findings from a Case-Control Study
1Department of Public Health and Primary Care, University of Oxford Gibson Building, Radcliffe Infirmary, Oxford OX2 6HE, England
2Department of Human Nutrition, University of Otago P. O. Box 56, Dunedin, New Zealand
Reprint requests to Dr. Margaret Thorogood, Department of Public Health and Primary Care, University of Oxford, Gibson Building, Radcliffe Infirmary, Oxford OX2 6HE, England.
A case-control study of women less than 40 years of age in England and Wales was performed to evaluate the risk of fatal stroke associated with the use of the newer, low-dose oral contraceptives. Included were 296 cases with subarachnoid hemorrhage, 105 cases with other hemorrhagic stroke, and 21 cases with occlusive stroke, all of which occurred during 1986–1988. Two living controls per case, matched for age and marital status, were chosen from the general practice lists. The power of the study was such that the minimum significant increased relative risk of subarachnoid hemorrhage associated with ever having used oral contraceptives that could have been detected with 90% certainty was 1. 6; the equivalent value for occlusive stroke was 28. 4. Relative risk was estimated by conditional logistic regression allowing for matching. The adjusted relative risk of subarachnoid hemorrhage associated with oral contraceptives was estimated to be 1. 1 (95% confidence interval (Cl) 0. 6–1.9) for current use and 1. 3 (95% Cl 0. 9–1.8) for ever use, while the equivalent relative risk of an occlusive stroke associated with ever use was 4. 4 (95% Cl 0. 8–24.4). Oral contraceptive use may be associated with a small increase in the risk of subarachnoid hemorrhage. These data are consistent with a substantial increase in the risk of occlusive stroke associated with oral contraceptive use.
cerebrovascular disorders; contraceptives; oral; subarachnoid hemorrhage
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