Table 7.

Hormonal Contraceptive Use Duration Predicting Sexual Intercourse: Duration Variable Results from Separate Models by Method Type using 3-Level Generalized Multilevel Models

Duration variable (time-varying)	B	SE	p	AOR	AOR 95% C.I.
Pill only
No use (prior to initiation)	−0.62	0.10	<.001	0.54	(0.443,0.647)
<1 month (reference)	-	-	-	1.00	-
1 to <6 months	0.04	0.08	.614	1.04	(0.887,1.226)
6 to <12 months	0.10	0.13	.417	1.11	(0.864,1.422)
12+ months	−0.03	0.16	.840	0.97	(0.708,1.324)
Ring only
No use (prior to initiation)	−0.82	0.39	.037	0.44	(0.205,0.952)
<1 month (reference)	-	-	-	1.00	-
1 to <6 months	−0.17	0.38	.664	0.85	(0.402,1.786)
6 to <12 months	−0.36	0.58	.533	0.70	(0.223,2.171)
12+ months	−0.60	0.76	.425	0.55	(0.124,2.409)
Injectable only
No use (prior to initiation)	−0.71	0.14	<.001	0.49	(0.371,0.652)
<1 month (reference)	-	-	-	1.00	-
1 to <6 months	−0.45	0.15	.003	0.64	(0.474,0.858)
6 to <12 months	−0.53	0.24	.026	0.59	(0.369,0.939)
12+ months	−1.22	0.35	<.001	0.29	(0.148,0.585)
IUD/Implant only
No use (prior to initiation)	−0.94	0.40	.017	0.39	(0.179,0.846)
<1 month (reference)	-	-	-	1.00	-
1 to <6 months	0.15	0.21	.465	1.17	(0.771,1.766)
6 to <12 months	0.26	0.28	.348	1.30	(0.753,2.236)
12+ months	0.23	0.27	.386	1.26	(0.746,2.132)

Note. B = Unstandardized coefficients. C.I. = Confidence interval. SE = Standard error. AOR = Adjusted odds ratio. Full results available in supplemental materials. Due to low frequencies of reported use for some method types, duration indicator variables were condensed to 5 categories from the original 8 to ensure sufficient data for valid analyses (at least 100 reports in most categories). Even with the condensed categories, the contraceptive patch was reported too infrequently for this model to be estimated.