Table 2.

Demographic Comparisons between AAFP Respondents and AAFP NRN Respondents Across 3 National Surveys

	Hepatitis C Survey		Hyperlipidemia Survey		Pharyngitis Survey
Demographic Characteristic	AAFP	NRN	AAFP	NRN	AAFP	NRN
AAFP = American Academy of Family Physicians; NRN = National Research Network.
^a P values based on χ² tests using categorical data and t tests (independent samples) for comparing means between the 2 groups.
^b Data obtained from AAFP Member Master Database for both AAFP and AAFP NRN respondents and not from survey.
Sex
Male, %	70	76	70	76	71	72
Female, %	30	24	30	24	29	28
No. of cases	596	174	641	152	523	181
Probability^a	.089		.137		.749
Practice location
Urban, %	24	33	Item not asked	Item not asked	21	32
Suburban, %	39	35	–	–	43	39
Rural, %	37	33	–	–	35	29
No. of cases	585	171	–	–	505	175
Probability^a	.054		–	–	.016
Practice type
Single specialty, %	67	46	71	61	Item not asked	Item not asked
Multispecialty, %	20	16	18	19	–	–
Residency university, %	4	37	No such category	No such category	–	–
Other, %	9	2	11	20	–	–
No. of cases	592	173	641	148	–	–
Probability^a	<.001		.001	–	–	–
Census region
Northeast, %	15	24	16	21	14	23
Midwest, %	26	16	30	20	29	18
South, %	35	36	30	34	35	34
West, %	25	24	24	25	22	26
No. of cases	596	166	641	142	510	172
Probability^a	.009	–	.099	–	.006	–
Age, years
Mean, years	45.8	47.3	46.9	48.0	46.7	47.8
SD, years	9.0	7.6	9.1	7.8	9.0	8.2
No. of cases	591	174	630	152	524	161
Probability^a	.046	–	.186	–	.145	–
Years in practice
Mean years	14.5	16.4	15.4	17.0	14.7	16.1
SD, years	9.3	7.7	9.6	7.8	9.0	8.3
No. of cases	588	172	629	151	521	181
Probability^a	.015	–	.053	–	.067	–
Time in patient care
Mean, %	90.2	68.5	89.0	64.9	89.3^b	61.7^b
SD, %	12.9	27.6	11.7	27.3	12.2	32.7
No. of cases	597	174	641	155	524	161
Probability^a	<.001	–	<.001	–	<.001	–