Table 3. Influenza Vaccination Rates by Study Group Overall (Primary Analysis) and by Patient Subgroup at the End of the Study Period Excluding Self-reported Vaccinations.

Subgroup	Patients who received an influenza vaccination, %				P valuea
	0 Reminders	1 Reminder	2 Reminders	3 Reminders
All patients	37.5	38.0	38.2	38.2	.006
Age group, y
0.5-17	52.2	51.6	54.0	52.7	.88
18-64	32.0	32.8	32.8	32.8	.001
≥65	53.2	53.1	53.0	53.8	.31
Sex
Female	37.6	37.8	37.8	37.8	.39
Male	37.3	38.3	38.6	38.8	.001
Insurance
Private	35.3	35.5	36.1	36.0	.02
Public	51.6	53.7	51.7	52.4	.07
Other or unknown	32.5	38.6	33.7	34.1	.15
Race
White	39.0	39.7	39.9	39.6	.004
Black	30.6	31.8	31.6	34.5	.28
Asian	45.8	45.1	45.3	45.4	.72
Other or unknown	32.5	32.8	33.0	33.2	.04
Ethnicity
Hispanic	36.4	36.2	37.0	38.3	.41
Non-Hispanic or unknown	37.6	38.2	38.3	38.2	.004
Received influenza vaccination in prior 2 y
Yes	62.6	63.2	62.8	63.2	.23
No	15.3	15.9	16.3	16.1	<.001

^aP values are for differences between the combination of intervention groups and the control group adjusting for all other variables in the table.