. Author manuscript; available in PMC: 2015 Oct 1.

Published in final edited form as: Am J Prev Med. 2014 Aug 8;47(4):435–443. doi: 10.1016/j.amepre.2014.07.003

Table 2.

Influenza vaccination during pre-intervention (2010–2011) and intervention (2011–2012), overall and by age and race for each arm

Group	Intervention arm			Control arm

	Pre-intervention year n=43,292	Intervention year n=49,037	p-value for difference between years	Pre-intervention year n=38,306	Intervention year n=38,626	p-value for difference between years
	Vaccinated n (%)	Vaccinated n (%)	p-value for difference between years	Vaccinated n (%)	Vaccinated n (%)	p-value for difference between years
Overall	19,903 (46.0)	26,447 (53.9)	<0.001	17,492 (45.7)	19,335 (50.1)	<0.001
Age group^†
6–23 months	3,890 (70.2)	4,680 (75.0)	<0.001	2,914 (66.3)	3,088 (72.7)	<0.001
2–8 years	9,945 (49.8)	12,938 (57.9)	<0.001	9,450 (52.8)	9,138 (56.6)	<0.001
9–18 years	6,068 (34.1)	8,829 (43.2)	<0.001	6,128 (34.2)	7,109 (39.0)	<0.001
Race^†
Non-white	3,334 (33.7)	6,660 (50.9)	<0.001	3,046 (36.4)	3,440 (43.1)	<0.001
White	16,569 (49.6)	19,787 (55.0)	<0.001	14,446 (48.3)	15,895 (51.9)	<0.001

Note: Boldface indicates statistical significance.

^†

Differences across age groups and racial groups are significant (p<0.001) in both pre-intervention and intervention years.

Numbers represent number of children, not number of doses; vaccination rates were calculated for all sites combined for each intervention arm (Intervention and Control).