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Failure rate (contraception / efficacy of method)

Authoring team

Technique:

Method

Failure Rate defined as % of women experiencing unintended pregnancy with typical /normal use)

Norplant; failure rate 0.2-1.1

6 (3)

Implanon (3)

fewer than 0.1 in 100 over 3 years (3)

Mirena coil

0.09

combined pill

0.2-0.3

mini-pill

0.3-5

condom

2-15

diaphragm and spermicide

5

IUCD (see below)

0.3-4

coitus interruptus

30

rhythm method

30 - 40

Depo Provera

< 0.5

none

85

 

Interpretation - 5% failure rate means that if 100 women used this form of contraception, 5 would be pregnant within one year.

Reference:

  1. Trussell J. Contraceptive failure in the United States, Contraception, 2011

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