Objectives
To determine women's knowledge of contraceptive effectiveness.
Study Design
We performed a cross-sectional analysis of a contraceptive knowledge questionnaire completed by 4,144 women enrolled in the Contraceptive CHOICE Project prior to receiving comprehensive contraceptive counseling and choosing their method. For each contraceptive method, women were asked “what percentage would get pregnant in a year: <1%, 1-5%, 6-10%, >10%, don't know.”
Results
Overall, 86% of subjects knew the annual risk of pregnancy was >10% if no contraception is used. More than 45% of women overestimate the effectiveness of depo-medroxyprogesterone acetate, pills, patch, ring, and condoms. After adjusting for age, education and contraceptive history, women who chose the intrauterine device (IUD) [RRadj=6.9, 95% CI: 5.6-8.5] or implant [RRadj = 5.9, 95% CI 4.7-7.3] were significantly more likely to accurately identify the effectiveness of their method compared to women who chose either the pill, patch, or ring.
Conclusions
This cohort demonstrated significant knowledge gaps regarding contraceptive effectiveness and over-estimated the effectiveness of pills, patch, ring, DMPA, and condoms.