Failure rates for birth control methods when used correctly

(Number of pregnancies per 100 women per year)
Male condom alone	11
Female condom alone	21
Diaphragm with spermicide	17
Cervical cap with spermicide	17 to 23
Sponge with spermicide	14 to 28
Spermicide alone	20 to 50
Oral contraceptives	1 to 2
Contraceptive patch*	1 to 2
Vaginal contraceptive ring	1 to 2
Hormone shots	less than 1
IUD	less than 1
Periodic abstinence	20
Surgical sterilization (female)	less than 1
Surgical sterilization (male)	less than 1
Contraceptive patch is less effective in women who weigh more than 198 pounds.