Table 3.

Influenza Vaccination by Age, Sex, Race, and Health Insurance During Baseline, Active Intervention, and Maintenance Years^*

	Vaccinated, n (%)
Characteristic	Baseline (n = 35,534)	Active Intervention (n = 42,168)	Maintenance (n = 44,923)	P**
Age group
<2 y	3,124 (73.7)	3,882 (77.4)	4,758 (72.9)	.110
2–8 y	9,094 (54.7)	12,670 (64.3)	13,107 (65.6)	<.001
9–18 y	5,663 (38.6)†	8,614 (49.4)†	9,586 (52.0)†	<.001
Sex
Female	8,759 (49.8)	12,263 (59.1)	13,474 (61.0)	<.001
Male	9,122 (50.8)	12,903 (60.2)‡	13,977 (61.2)	<.001
Race
Nonwhite	2,497 (38.4)	6,435 (58.4)	6,518 (56.4)	<.001
White	15,384 (53.0)†	18,731 (60.1)§	20,933 (62.7)†	<.001
Health insurance
Self- or publicly insured	4,439 (40.3)	9,417 (58.2)	9,903 (56.5)	<.001
Commercially insured	13,442 (54.8)†	15,749 (60.6)†	17,548 (64.1)†	<.001
Overall	17,881 (50.3)	25,166 (59.7)	27,451 (61.1)	<.001

^*Baseline indicates July 2010 to February 2011; active intervention, July 2011 to February 2012; and maintenance, July 2012 to February 2013.

^**P value for difference across the 3 time periods by Cochran-Armitage trend test.

^†P < .001 within intervention year across demographic groups, by chi-square test.

^‡P < .05 within intervention year across demographic groups, by chi-square test.

^§P < .01 within intervention year across demographic groups, by chi-square test.