Table 1.

Adolescent characteristics and influenza vaccination according to MMR vaccine series initiation and completion.

Variable	Did not initiate MMR series (N = 5439)		Initiated MMR series, but not up-to-date (N = 4411)		Up-to-date on MMR series (N = 119,350)		Pa
	Weighted mean or proportion	95% CI	Weighted mean or proportion	95% CI	Weighted mean or proportion	95% CI
Received influenza vaccine at least once in past 3 years	0.39	0.38, 0.41	0.31	0.29, 0.32	0.50	0.50, 0.50	<.001
Age (yr)	15.1	15.1, 15.2	15.0	14.9, 15.0	14.9	14.9, 14.9	<.001
Sex							.012
Male	0.51	0.50, 0.52	0.54	0.52, 0.55	0.52	0.52, 0.53
Female	0.49	0.48, 0.50	0.46	0.45, 0.48	0.48	0.47, 0.48
Race/ethnicity
Hispanic	0.21	0.20, 0.22	0.19	0.18, 0.20	0.15	0.15, 0.16	<.001
Non-hispanic white	0.58	0.57, 0.60	0.63	0.61, 0.64	0.65	0.65, 0.66	<.001
Non-hispanic black	0.10	0.09, 0.11	0.09	0.08, 0.10	0.09	0.09, 0.09	.219
Other	0.11	0.10, 0.12	0.10	0.09, 0.11	0.10	0.10, 0.10	.111
Mother’s age
≤34 years	0.09	0.09, 0.10	0.10	0.09, 0.10	0.08	0.08, 0.08	<.001
35–44 years	0.44	0.43, 0.46	0.45	0.43, 0.46	0.41	0.40, 0.41	<.001
≥45 years	0.46	0.45, 0.47	0.46	0.44, 0.47	0.52	0.51, 0.52	<.001
Mother’s education
<12 years	0.13	0.13, 0.14	0.12	0.11, 0.13	0.10	0.10, 0.10	<.001
12 years	0.20	0.19, 0.21	0.19	0.18, 0.20	0.17	0.17, 0.17	<.001
>12 years (no college degree)	0.29	0.28, 0.30	0.29	0.28, 0.31	0.27	0.26, 0.27	<.001
College degree	0.38	0.37, 0.39	0.40	0.38, 0.41	0.46	0.46, 0.47	<.001
Mother’s marital status							<.001
Married	0.69	0.67, 0.70	0.71	0.69, 0.72	0.73	0.72, 0.73
Not married	0.31	0.30, 0.33	0.29	0.28, 0.31	0.27	0.27, 0.28
Annual household income
Above poverty, >$75,000	0.40	0.39, 0.41	0.41	0.39, 0.42	0.48	0.47, 0.48	<.001
Above poverty, ≤$75,000	0.39	0.37, 0.40	0.39	0.38, 0.41	0.35	0.35, 0.36	<.001
Below poverty line	0.21	0.20, 0.23	0.20	0.19, 0.21	0.17	0.17, 0.17	<.001
Health insurance coverage
Private	0.55	0.53, 0.56	0.54	0.53, 0.55	0.61	0.61, 0.62	<.001
Medicaid	0.33	0.31, 0.34	0.32	0.30, 0.33	0.29	0.28, 0.29	<.001
Other	0.07	0.06, 0.07	0.07	0.06, 0.07	0.05	0.05, 0.06	<.001
None	0.06	0.05, 0.07	0.08	0.07, 0.08	0.04	0.04, 0.05	<.001
Facilities where adolescent received vaccinations
Public clinics	0.16	0.15, 0.17	0.19	0.18, 0.20	0.14	0.14, 0.14	<.001
Hospital clinics	0.18	0.17, 0.19	0.12	0.11, 0.13	0.10	0.10, 0.10	<.001
Private clinics	0.45	0.44, 0.46	0.47	0.45, 0.48	0.50	0.50, 0.50	<.001
School or other clinics	0.10	0.09, 0.11	0.04	0.04, 0.05	0.03	0.02, 0.03	<.001
Multiple facility types	0.11	0.10, 0.12	0.18	0.17, 0.19	0.23	0.23, 0.23	<.001
Years since last well-child visit	1.0	0.9, 1.0	1.1	1.0, 1.1	0.8	0.8, 0.8	<.001

^aP values comparing weighted means or proportions by Wald test.

CI, confidence interval; MMR, measles, mumps, rubella.