TABLE 4

Contraceptive Method Efficacy

Method% of Women Experiencing an Unintended Pregnancy Within the First Year of Use% of Women Continuing Use at 1 Yearc
Typical UseaPerfect Useb
No method8585
Spermicides (foams, creams, gels, suppositories, and film,)281842
Fertility awareness-based methods2447
Withdrawal22446
Condom
 Female21541
 Male18243
Diaphragm12657
Combined pill and progestin-only pill90.367
Contraceptive patch90.367
Contraceptive ring90.367
DMPA injection60.256
IUD
 Copper T0.80.678
 Levonorgestrel0.20.280
Single-rod contraceptive implant0.050.0584
Female sterilization0.50.5100
Male sterilization0.150.10100
  • —, data not available.

  • Source: Trussell J. Contraceptive failure in the United States. Contraception. 2011;83(5):397–404.

  • a Among typical couples who initiate use of a method (not necessarily for the first time), the percentage who experience an unintended pregnancy during the first year if they do not stop use for any other reason. Estimates of the probability of pregnancy during the first year of typical use for spermicides, withdrawal, periodic abstinence, the diaphragm, the male condom, the pill, and Depo-Provera are taken from the 1995 and 2002 National Survey of Family Growth, corrected for underreporting of abortion; see the text for the derivation of estimates for the other methods.

  • b Among couples who initiate use of a method (not necessarily for the first time) and who use it perfectly (both consistently and correctly), the percentage who experience an unintended pregnancy during the first year if they do not stop use for any other reason.

  • c Among couples attempting to avoid pregnancy, the percentage who continue to use a method for 1 year.