Table 1.

Characteristics of the ten health plans from the Health Maintenance Organization Research Network (HMORN).

	Site 1	Site 2	Site 3	Site 4	Site 5	Site 6	Site 7	Site 8	Site 9	Site 10
Total enrollment, x1000 Structure, %	540	210	805	620	295	175	286	487	3,190	225
Staff/Group	80	90	20	64	65	85	90	100	100	100
Independent Phys. Assn.	20	10	80	0	30	15	10	0	0	0
Preferred provider	0	0	0	36	5	0	0	0	0	1
Clinic sites	30	41	14	34	70	41	10	27	103	17
Hospitals	2	84	21	84	10	4	3	1	11	1
Year electronic medical record implemented	2003–2005	1995	2000	2004	1988	1994	2006	1997	2004	2004–2005
Demographics
Age, years, %
≤24	30	27	33	36	30	31	32	31	34	33
25–44	24	26	31	29	26	23	34	27	27	29
45–64	33	30	29	27	31	26	27	30	27	27
65–74	7	8	4	4	7	9	4	7	7	6
≥75	6	9	3	4	6	10	3	5	5	5
Female, %	53	51	52	52	55	53	52	52	53	51
Race, %
White	82	96	75	85	67	97	63	84	38	27
African-American	3	<1	16	6	28	<1	33	3	8	2
Asian-American	6	0	5	5	2	<1	<1	5	10	39
Am Indian	1	<1	<1	<1	<1	<1	<1	1	<1	2
Hispanic	4	1.4	4	4	1	<1	<1	6	41	7
Hawaiian/Pacific Islander	0	0	0	0	0	0	0	<1	0	31
Other	3	<1	0	0	2	<1	4	1	<1	17