Weight has no effect on contraceptive efficacy: study

US researchers followed more than 1500 women who were using an oral contraceptive pill, a patch or a vaginal ring for three years, finding 128 cases of contraceptive failure.

The rate of failure was similar across all BMI categories: 8.44% among women with BMI <25, 11% for BMI 25–30 and 8.92% for women with BMI >30.

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