Figure 3.

Contraceptive method use by women before and after their initial visit to a Zika Contraception Access Network (Z-CAN) provider in Puerto Rico, as of Aug 15, 2017 (N=21 124)

Proportions might not add up to 100% because of missing data. Most effective contraceptive methods include intrauterine devices, implants, and partner sterilisation. Less than 1% of women using these methods will get pregnant during the first year of typical use. Moderately effective contraceptive methods include injectables, pills, patch, ring, and diaphragm. 6–12% of women using these methods will get pregnant during the first year of typical use. Least effective birth control methods include male and female condoms, withdrawal, sponge, fertility awareness methods, and spermicides. Least effective birth control methods have a failure rate of 18 or more pregnancies per 100 women who use these methods each year. The Centres for Disease Control and Prevention have produced an overview of the effectiveness of family planning methods. Methods provided by Z-CAN included intrauterine devices, implants, injectables, pills, patch, ring, and male condoms.