. Author manuscript; available in PMC: 2018 Feb 9.

Published in final edited form as: Arch Sex Behav. 2016 Mar 3;46(2):419–432. doi: 10.1007/s10508-016-0692-8

Table 5.

Odds ratios of at least one instance of unprotected sex by study wave

Wave^a	N	Trajectory class: wald (df = 2)	Multiple partners	Single partners	Exclusive relationship
1	802	19.50^***	5.13^***	2.59^**	1.29
2	843	23.63^***	5.66^***	2.29^*	2.02^***
3	908	34.29^***	6.46^***	2.37^**	1.22
4	913	30.12^***	5.74^***	2.37^**	0.95
5	893	32.94^***	5.03^***	1.64^*	0.85
6	884	42.39^***	7.55^***	2.35^***	0.98
7	908	30.46^***	4.50^***	1.67^*	0.72^*
8	861	13.51^***	2.89^***	1.60^*	0.67^*
9	878	8.61^***	2.19^**	1.60^*	0.70^*
10	928	32.14^***	5.02^***	2.14^***	1.77^**

Analyses for each wave only included those who reported at least one sexual partner; thus, the sample size (N) and precise sample composition vary by wave. Reference categories are (1) Rare sex partners and (2) some non-exclusivity. Df = degrees of freedom. The following demographic variables were also included as covariates in these analyses: biological sex, ethnicity, family income, and mother and father’s highest education.

p < 0.05,

^**

p < 0.01,

^***

p < 0.001