Table 3.3Percentage of women continuing use at the end of the first year (United States); adapted with permission from Trussell435

MethodWomen continuing use at one year(%)a
No methodb
Periodic abstinence51
Ovulation method
 Parous women46
 Nulliparous women57
 Parous women46
 Nulliparous women57
 Female (Reality)49
Combined pill and minipill68
Evra patch68
 Progestasert (progesterone T)81
 ParaGard (copper T)78
 Mirena (LNG-IUS)81
Norplant and Norplant-284
Female sterilisation100
Male sterilisation100
Emergency contraceptive pills: treatment initiated within 72 hours after unprotected intercourse reduces the risk of pregnancy by at least 75%.g
Lactational amenorrhea method: LAM is a highly effective, temporary method of contraception.h

Among couples attempting to avoid pregnancy, the percentage who continue to use a method for 1 year.


The percentages becoming pregnant are based on data from populations where contraception is not used and from women who cease using contraception in order to become pregnant. Among such populations, about 89% become pregnant within 1 year. This estimate was lowered slightly (to 85%) to represent the percentage who would become pregnant within 1 year among women now relying on reversible methods of contraception if they abandoned contraception altogether.


Foams, creams, gels, vaginal suppositories and vaginal film.


Cervical mucus (ovulation) method supplemented by calendar in the pre-ovulatory and basal body temperature in the post-ovulatory phases.


With spermicidal cream or jelly.


Without spermicides.


The treatment schedule is one dose within 120 hours after unprotected intercourse, and a second dose 12 hours after the first dose.


However, to maintain effective protection against pregnancy, another method of contraception must be used as soon as menstruation resumes, the frequency or duration of breastfeeds is reduced, bottle feeds are introduced, or the baby reaches 6 months of age.

NB. Some of the methods listed in this table are not available in the UK and some of the methods available in the UK are not available in the USA and therefore are not listed here. This table does not include any data on Implanon. ParaGard® is the TCu 380A IUD.

From: 3, Contraceptive use and principles of care

Cover of Long-acting Reversible Contraception
Long-acting Reversible Contraception: The Effective and Appropriate Use of Long-Acting Reversible Contraception.
NICE Clinical Guidelines, No. 30.
National Collaborating Centre for Women’s and Children’s Health (UK).
London: RCOG Press; 2005 Oct.
Copyright © 2005, National Collaborating Centre for Women’s and Children’s Health.

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