TABLE 1. Contraceptive efficacy of barrier methods.

USA - 1986/1989	Pregnancy Rate (%)
Condoms Spermicide Diaphragm Rhythm/NFP No method Oral contraception IUDs Sterilization	14 - 16 22 - 26 17 - 19 6 - 20 ~ 40 4 - 6 1 - 4 0.1 - 0.5

* Retrospective studies