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The incidence of breast cancer among users and non-users of oral contraceptives (OCs) was determined at Group Health Cooperative of Puget Sound, Seattle, Washington, a health care organization which maintains computer files of diagnoses and outpatient drug use. In women 45 years of age or younger, the incidence was nearly identical in users and non-users. In premenopausal women over 45 years of age, there was a positive association between current OC use and breast cancer, the risk ratio estimates and 90% confidence intervals being 4.0 (1.8-9.0) in women 46-50 years of age and 15.5 (5.2-46) in women 51-55 years of age.
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South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde,
