2003 HEDIS data suggest growing quality gap between HMOs, other payers.
D000293:Adolescent; D000328:Adult; D006279:Health Maintenance Organizations / Q000458:organization & administration / Q000592:standards*; D006801:Humans; D008484:Medicaid / Q000458:organization & administration; D006278:Medicare / Q000458:organization & administration; D008875:Middle Aged; D011787:Quality of Health Care / Q000706:statistics & numerical data*; D014481:United States