Table 1.

Demographic Characteristics of All Patient Visits to U.S. Resident and Staff Primary Care Physicians as Percentages, 1997-2004

Variable	Resident Physician	Staff Physician	χ2 P value
	Visits	Visits
	n = 6322	n = 27578
	%	%
Patient characteristics
Sex
Women	68.5	64.8	0.019
Age
20-44	46.8	38.7	<0.001
45-64	37.4	35.2
>=65	15.8	26.2
Race
White	52.2	67.8	<0.001
Black/African American	34.5	17.8
Hispanic	11.4	11.2
Other	1.9	3.2
Comorbiditya
Yes	34.7	31.6	NS
Mean number	0.49 ± 0.06	0.42 ± 0.02	NS
Visit characteristics
Medical insurance
Private	19.5	38.0	<0.001
Government-sponsored
Medicaid/SCHIP	31.8	19.8
Medicare	17.4	24.5
Other†	31.2	17.7
Visit type
Preventive care	19.1	16.0	NS
Treatment visit	80.9	84.0
Geographic region
Northeast	29.2	27.6	NS
Midwest	33.6	29.0
South	29.4	33.8
West	7.8	9.6
Metropolitan statistical area
Yes	99.0	79.0	<0.001

^aComorbidity defined as coronary heart disease (n = 967), diabetes (n = 3554), hypertension (n = 6469), hypercholesterolemia (n = 1504), congestive heart failure (n = 507) or stroke (n = 207)

^†“Other” denotes self-pay, no charge/charity, worker’s compensation, other and unknown