Table 2.

Frequency distributions (weighted percentages unless indicated otherwise) of socioeconomic and demographic characteristics of DC and GP patients, by country and pattern of health-care use in the past 12 months: Joint Canada/US Survey of Health, 2002–03*

		United States			Canada
Variable	Category	GP only (n = 3565)	GP+DC (n = 511)	DC only (n = 84)	GP only (n = 2434)	GP+DC (n = 397)	DC only (n = 51)
Age (Years)	18–44	47.8	47.6	65.7	48.5	53.0	81.1
	45–64	33.0	38.8	28.3	32.8	35.2	15.6
	≥ 65	19.2	13.6	6.1	18.7	11.8	3.3
	Mean (SE)	47.2 (0.3)	46.1 (0.8)	40.3 (1.4)	46.5 (0.4)	44.6 (0.8)	34.4 (2.0)
	Median	45	45	38	45	43	33
Sex	Male	45.1	42.2	50.5	45.5	42.7	77.2
	Female	54.9	57.8	49.5	54.5	57.3	22.8
Race/ethnicity	White only	68.9	81.4	73.3	80.1	86.9	85.5
	Other/multiple	26.7	15.4	24.1	18.4	12.8	14.5
Education	No H.S. degree	10.8	8.0	10.4	20.7	13.9	23.3
	High school degree	35.4	35.1	39.6	29.2	31.5	38.4
	Some college	13.9	13.0	20.0	21.7	20.0	22.1
	4-year college degree 35.6	41.1	27.3	27.0	33.3	16.1
Marital status	Married/with partner	61.8	66.2	64.0	64.9	70.9	60.6
	Widowed	7.1	4.6	4.1	6.7	4.5	0.0
	Separated/divorced	10.3	11.5	10.8	7.5	8.5	2.8
	Single	16.9	14.8	18.5	19.7	15.9	36.6
Household income (adjusted for household size)	Lowest quintile	14.8	10.5	15.5	18.2	11.5	11.6
	Lower middle	16.3	18.4	15.8	17.0	18.2	24.2
	Middle	15.1	15.7	13.7	16.6	16.2	19.5
	Upper middle	14.8	18.7	15.9	16.9	20.6	16.9
	Highest	14.9	18.5	16.8	15.2	22.8	13.1
Main income source	Employment	69.6	76.5	82.1	71.6	79.4	82.0

* Weighted percentages may not sum to 100 because of missing data or exclusion of certain categories; percentages weighted to account for age, sex, region (Canada only), and race/ethnicity (U.S. only); 3565, 511, and 84 represent 138,802,519, 20,060,412, and 3,453,164 adults, respectively, in the U.S.; 2434, 397, and 51 represent 16,555,719, 2,723,870, and 381,147 adults, respectively, in Canada.

GP = general practitioner or family doctor; DC = Doctor of Chiropractic; SE = standard error.