Table 4.

Female Respondents' Self-Reported Reasons for Unintended Pregnancies by Contraceptive Use, National Survey of Family Growth interview, 2006–2010

Reasons why pregnant despite contraception use	% of 243 unweighted, n=980,775 weighted, unintended pregnancies*
Improper use	45
Contraceptive failure	42
Don't know, missing	13

Reasons why no contraceptive use	% of 238 unweighted, n=965,414 weighted, unintended pregnancies*
Did not think could get pregnant	37
Not expecting sex	17
Did not really mind if got pregnant	16
Worried about side effects	12
Male partner himself did not want to use contraception	6
Male partner did not want respondent to use contraception	3
Unable to obtain contraception	1
Don't know/missing	8

^*Pregnancies within three years of NSFG interview.