The effect of report cards on Medicare HMO enrollment.
D005260:Female; D005544:Forecasting; D019981:Health Care Sector / Q000639:trends; D006279:Health Maintenance Organizations / Q000706:statistics & numerical data / Q000639:trends*; D006801:Humans; D006278:Medicare / Q000706:statistics & numerical data / Q000639:trends*; D010174:Pamphlets; D010353:Patient Education as Topic; D010358:Patient Participation; D017060:Patient Satisfaction; D019984:Quality Indicators, Health Care / Q000639:trends*; D014481:United States