Loading...
Women with elevated BMIs may be at increased risk for contraceptive failure with hormonal implants and patches. Might the same be true for oral contraceptives (OCs)? In this study, investigators matched women who had positive pregnancy tests within 3 months of filling OC prescriptions at a health plan pharmacy with women who filled prescriptions but did not conceive. In interviews, 248 cases and 533 comparison subjects verified that they took the OCs, used them for contraception, and had intercourse. In addition, they reported their weight (verified when possible from medical records) and had their height measured.
BMI was divided into quartiles. The risk for pregnancy was significantly higher for women in the highest quartile (BMI, >27.3) t…