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. Author manuscript; available in PMC: 2010 Jan 26.
Published in final edited form as: Contraception. 2007 Dec 3;77(1):10–21. doi: 10.1016/j.contraception.2007.09.013

Table 1.

Probability of failure within the first 3, 6 and 12 months of contraceptive use in the United States: weighted data, both corrected and uncorrected for underreporting of abortion in the 2002 NSFG

Method
 Probability of failure,
corrected
 Probability of failure,
uncorrected
 Unweighted
N**
3 mo. 6 mo. 12 mo. 3 mo. 6 mo. 12 mo.
Injectable 2.0 3.2 6.7 1.7 3.9 7.5 715
Pill 2.6 5.3 8.7 2.3 4.9 7.7 2541
Male condom 5.4 9.6 17.4 4.9 8.6 13.9 3845
Withdrawal 7.8 11.3 18.4 9.5 12.8 18.8 848
Fertility awareness 9.5 14.6 25.3 8.8 14.5 23.0 236
All methods* 4.2 7.3 12.4 4.1 7.1 11.1 9033
*

Includes all other methods.

**

N=number of segments.