Table 1.

Characteristics of Physician Organizations

CharacteristicTotal (N = 957)
IPA = independent practice association; MD = medical doctor; HMO = health maintenance organization.
* As defined in the American Medical Association census (Havlicek PI. Medical Groups in the US, 1999. Chicago, Ill: American Medical Association; 1999).
Organizational type, No. (%)
    Medical group621 (64.9)
    IPA336 (35.1)
Ownership type, No. (%)
    Hospital/health plan376 (39.3)
    MD456 (47.6)
    Other125 (13.1)
Region,* No. (%)
    East North Central169 (17.7)
    East South Central45 (4.7)
    Middle Atlantic101 (10.6)
    Mountain59 (6.2)
    Northeast58 (6.1)
    Pacific245 (25.6)
    South Atlantic118 (12.3)
    West North Central81 (8.4)
    West South Central81 (8.4)
Practice location, No. (%)
    Urban/suburban665 (69.5)
    Rural/small town292 (30.5)
Age of organization, mean (SD), y25.7 (21.9)
No. of MDs, mean (SD)239.9 (424.1)
No. of clinic sites, mean (SD)77.9 (266.6)
County HMO penetration, mean (SD), %33.1 (17.2)
Physicians who are primary care physicians, mean (SD), %50.9 (28.2)
Capital per MD, log, mean (SD)120,706.7 (359,996.0)