Table 3.

Main effects and interactions of study arm, age group (adolescent 18–19 years vs. young adults 20–25 years), and parity (nulliparous vs. parous) on LARC counseling and selection

	Counseled on LARC (n = 1,500)						Selected LARC (n = 1,500)
	Model 1: main effects		Model 2: interaction (intervention by adolescent)		Model 3: interaction (intervention by nulliparous)		Model 1: main effects		Model 2: interaction (intervention by adolescent)		Model 3: interaction (intervention by nulliparous)
	aOR	[95% CI]	aOR	[95% CI]	aOR	[95% CI]	aOR	[95% CI]	aOR	[95% CI]	aOR	[95% CI]
Intervention	3.99	[2.86–5.57]***	4.03	[1.80–5.82]***	3.21	[2.14–4.81]***	2.30	[1.71–3.10]***	2.21	[1.58–3.08]***	2.49	[1.61–3.87]***
Adolescent (18–19 years)	.85	[.63–1.15]	.87	[.58–1.32]	.85	[.63–1.14]	.86	[.64–1.17]	.75	[.46–1.22]	.86	[.64–1.17]
Intervention by adolescent interaction	—	—	.95	[.55–1.64]	—	—	—	—	1.24	[.67–2.31]	—	—
Nulliparous	.57	[.42–79]**	.57	[.42–.79]**	.50	[.33–.75]**	.53	[.37–.75]***	.52	[.37–.75]***	.57	[.39–.85]**
Intervention by nulliparous interaction	—	—	—	—	1.35	[.79–2.29]	—	—	—	—	.87	[.49–1.53]

^**p ≤ .01;

^***p ≤ .001.

Models also include race/ethnicity, multiple sexual partners, insurance status, pregnancy intentions, LARC use prior to study enrollment, practice setting, and family planning Medicaid expansion.

aOR = adjusted odds ratio; CI = confidence interval.