Table 4. Influenza Vaccination Rates by Study Group Overall and by Patient Subgroup at the End of the Study Including Self-reported Vaccinations.

Subgroup	Patients who received an influenza vaccination, %				P valuea
	0 Reminders	1 Reminder	2 Reminders	3 Reminders
All patients	37.8	39.2	40.0	40.7	<.001
Age group, y
0.5-17	52.3	51.9	54.4	53.1	.70
18- 64	32.4	34.1	34.8	35.5	<.001
≥65	53.6	54.6	55.1	56.7	<.001
Sex
Female	37.9	39.1	39.8	40.5	<.001
Male	37.7	39.3	40.3	41.0	<.001
Insurance
Private	35.7	36.7	37.9	38.6	<.001
Public	52.0	54.9	53.5	54.8	<.001
Other or unknown	32.9	39.3	36.2	36.1	.04
Race
White	39.3	41.0	41.8	42.2	<.001
Black	31.1	32.9	33.1	36.0	.07
Asian	46.3	46.7	47.6	49.3	.007
Other or unknown	32.7	33.6	34.6	35.4	<.001
Ethnicity
Hispanic	36.7	37.1	38.6	40.4	.02
Non-Hispanic or unknown	37.9	39.4	40.2	40.8	<.001
Received influenza vaccination in the prior 2 y
Yes	63.1	65.0	65.7	67.0	<.001
No	15.5	16.6	17.3	17.4	<.001

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