Table 1.

Population characteristics

	Kaiser Permanente (%)	Danish Population (%)
Age in years
0–4	6.0	6.4
5–15	15.0	13.0
16–44	43.1	40.2
45–64	25.7	25.6
65–74	6.3	8.1
75–84	3.2	5.2
≥ 85	0.7	1.8
Educational level
Less than high school	5.3	37.4
High school or higher	54.9	42.3
Bachelors degree or higher	39.8	20.3
Household income in USD (thousands)
< 15	6.1	16.0
15–25	9.2	14.6
25–35	11.1	13.8
35–50	17.5	15.6
50–65	12.9	17.9
65–80	13.3	11.1
80–100	12.1	6.1
> 100	17.9	4.9

Data on educational level of KP membership is from 2002.

Danish utilisation index is from 2001; index adjusted for age, sex and income where all inhabitants older than 15 years = 100.

Data on household income levels of Kaiser Permanente membership is from 1998.