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. Author manuscript; available in PMC: 2021 Jul 13.
Published in final edited form as: Soc Forces. 2019 May 29;98(3):1370–1401. doi: 10.1093/sf/soz049
Irrespective of whether had intercourse: If had intercourse and…
Did not used hormonal: Used hormonal:
Had intercourse Used hormonal Used coital (condoms or withdrawal) Also used coital
β OR β OR β OR β OR
Desire for sex+ .16 1.18 *** .17 1.18 *** −.13 .87 ** −.10 .91 *
(.02) (.02) (.05) (.05)
Personal attitudes & intentions+
Approval: premarital sex −.01 .99 .10 1.10 *** −.07 .94 .05 1.05
(.02) (.02) (.06) (.06)
Approval: sex w. friends .03 1.03 .07 1.07 ** −.20 .82 *** −.11 .90 *
(.02) (.02) (.06) (.05)
Wants to get pregnant .67 1.96 *** −.59 .55 *** −1.34 .26 *** .10 1.11
(.08) (.09) (.13) (.23)
Previous experiences+ & age
Cum. no. sex partners .12 1.13 *** .00 1.00 .02 1.02 .00 1.00
(.01) (.04) (.04) (.04)
Cumulative no. live births −1.15 .32 *** 1.53 4.60 *** 1.79 5.97 *** 1.53 4.60 ***
(.11) (.22) (.41) (.22)
Age −.11 .90 *** −.58 .56 *** −.62 .54 *** −.58 .56 ***
(.03) (.11) (.09) (.11)
Current relationship
Status (ref: none)
 Married 3.28 26.57 *** .20 1.23 −1.91 .15 *** −2.18 .11 ***
(.13) (.15) (.34) (.51)
 Engaged 3.14 23.22 *** .51 1.66 *** −.80 .45 *** −1.51 .22 ***
(.09) (.10) (.24) (.30)
 Special 3.04 21.00 *** .32 1.38 *** −.38 .68 * −.87 .42 ***
(.05) (.06) (.19) (.19)
Relationship duration .00 1.00 .00 1.00 −.00 1.00 −.01 .99
(.00) (.00) (.01) (.01)
Friend context+
Friends’ approval of sex .15 1.16 *** .07 1.08 *** .02 1.02 .03 1.03
(.02) (.02) (.05) (.06)
Prop. friends sex. active .08 1.08 ** .21 1.23 *** .04 1.04 −.32 .73 ***
(.03) (.03) (.08) (.08)
Family context+ & race
Parents’ approval of sex .07 1.07 *** .06 1.06 ** −.21 .81 *** −.03 .97
(.02) (.02) (.05) (.05)
Institutional contexts+
School
 Enrolled in college −.07 .93 .24 1.26 *** .05 1.05 .16 1.17
(.05) (.06) (.14) (.14)
Current contraceptive behavior
Used hormonal contra. this week .59 1.80 *** -- -- --
(.10) -- -- --
Desire for sex+ * Used hormonal .09 1.09 *** -- -- --
(.03) -- -- --
Current sexual behavior
Had intercourse this week -- .82 2.27 *** -- --
-- (.04) -- --
Observations (weeks) 39,723 33,125 5,321 6,168
Number of respondents 679 537 244 244
Reference category Did not have intercourse Did not use hormonal Did not use any method Used hormonal but not coital

Note: In the first two models, the sample is comprised of all respondents’ study weeks. In the third model, the sample is comprised of respondents’ study weeks what they had intercourse and did not use hormonal contraception. In the last model, the sample is comprised of respondents’ study weeks when they had intercourse and used hormonal contraception. The number of respondents (and corresponding weeks) is not uniform across models because some respondents switched methods during the study. These respondents appear in multiple models.

Standard errors in parentheses,

***

p<0.001,

**

p<0.01,

*

p<0.05

+

Measures are lagged and reflect respondents’ situation as of the prior week.