. 2015 Nov;136(5):850–859. doi: 10.1542/peds.2015-1563

TABLE 2.

Predictors of 1 Dose HPV Vaccine Coverage at 12 Months After Randomization: Univariate, Multivariate, and Interaction Logistic Regression Models (n = 814)

	Univariate Models	Multivariate Model	Interaction Model
	OR (95% CI)	AOR (95% CI)	AOR (95% CI)
−2 Log L ^a	—	1088.059	1081.359
Study group
AC	Reference	Reference	Reference
I	1.12 (0.85–1.48)	1.11 (0.84–1.47)	1.43 (1.02–2.02) ^c
Race/Ethnicity
Hispanic	Reference	Reference	Reference
Non-Hispanic black	0.61 (0.45–0.84) ^b	0.46 (0.31–0.69) ^b	0.68 (0.41–1.13)
Non-Hispanic white	0.99 (0.48–2.04)	1.06 (0.50–2.23)	1.53 (0.56–4.23)
Study group × race/ethnicity
Hispanic: I versus AC	—	—	1.43 (1.02–2.02) ^c
Non-Hispanic black: I versus AC	—	—	0.64 (0.37–1.10)
Non-Hispanic white I versus AC	—	—	0.65 (0.15–2.76)
Age group at randomization
11–12 y	Reference	Reference	Reference
13–18 y	0.63 (0.48–0.84) ^b	0.67 (0.50–0.90) ^b	0.67 (0.50–0.90) ^b
Clinic, first appointment
Clinic 1	Reference	Reference	Reference
Clinic 2	1.06 (0.73–1.54)	0.72 (0.47–1.12)	0.71 (0.46–1.10)
Clinic 3	0.93 (0.66–1.32)	0.54 (0.35–0.83) ^c	0.54 (0.35–0.84) ^c
Clinic 4	0.93 (0.60–1.45)	0.61 (0.36–1.01)	0.61 (0.37–1.02)
Parent consented for additional contact
No consent	Reference	Reference	Reference
Yes, consented	1.73 (1.30–2.29) ^b	1.67 (1.25–2.23) ^b	1.67 (1.25–2.24) ^b

AC, active comparison; I, intervention.

Likelihood ratio test comparing multivariate and interaction models (1088.059–1081.359 = 6.7 with 10–8 = 2 DF) is significant at P = .035.

P < .01.

P < .05.