Table 1.

Adult primary care visits with and without electronic health records and electronic preventive care reminders, 2006–2010

	No EHR (N=71 295 sample records*)	EHR (N=60 981 sample records†)	p Value	No e-reminder (N=28 411 sample records‡)	e-Reminder (N=32 570 sample records§)	p Value
	%	%		%	%
Age (mean)	52.5±0.4	53.2±0.4	0.12	54.6±0.6	52.4±0.5	<0.0001
Race			0.09			0.30
White	74	76		75	77
Non-white	26	24		25	23
Reason for visit			0.31			0.14
General medical examination	29	28		29	27
Other	71	72		71	73
Patient seen previously?			0.22			0.73
Yes	87	86		86	86
Expected payment source			<0.0001			0.0005
Private insurance	37	40		37	42
Medicare	21	23		24	22
Medicaid	22	20		21	19
Other	16	12		14	11
Income category			0.007			0.03
≤$32 793	29	27		29	25
$32 794–40 626	25	24		23	24
$40 627–52 387	22	21		21	21
≥$52 388	20	20		21	24
Region			0.06			0.74
Northeast	25	26		24	29
Mid-west	27	25		30	21
South	31	27		29	26
West	18	21		18	24

*Represents 1.3 billion estimated visits without an EHR.

†Represents 1.1 billion estimated visits with an EHR.

‡Represents 460 million estimated visits without an e-reminder.

§Represents 680 million estimated visits with an e-reminder.

EHR, electronic health record.