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Contraceptive Reliability

Method
Average number of unplanned pregnancies in 100 users

Combination birth control pills

8

Injections (Depo-Provera)

3

Transdermal patch

8

Progestin-only pills (mini-pills)

8

Vaginal ring

8

IUD (Levonorgestrel (LNg 20) IUD)

Fewer than 1

Copper T 380-A IUD

Fewer than 1

Condom, male

15

Withdrawal

27

Condom, female

21

Diaphragm with spermicide

16

Spermicide alone

29

Sponge with spermicide (no previous vaginal childbirth)

16

Sponge with spermicide (after vaginal childbirth)

32

Cervical cap (no previous vaginal childbirth)

16

Cervical cap (after vaginal delivery)

32

Periodic abstinence and fertility awareness methods

25

Vasectomy

Fewer than 1

Tubal ligation or tubal implants

Fewer than 1

No birth control

85




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