Table 2. Characteristics of Medicare Managed Care Health Plans: 1998.
| Characteristic | Mean | Standard Error | Percent |
|---|---|---|---|
| Plan Age | 18.70 | 0.77 | — |
| Type of Physician Network | |||
| Group or Staff | — | — | 21.0 |
| Independent Practice Association | — | — | 60.0 |
| Network | — | — | 19.0 |
| Total Enrollment | |||
| ≤ 75,000 | — | — | 17.8 |
| 75,001 – 400,000 | — | — | 52.9 |
| ≥ 400,001 | — | — | 29.3 |
| Plan Type | |||
| National For-Profit | — | — | 48.6 |
| National Not-For-Profit | — | — | 8.7 |
| Local For-Profit | — | — | 19.7 |
| Local Not-for-Profit | — | — | 23.1 |
| Competitor Index | 3.71 | 0.18 | — |
| National Committee for Quality Assurance Accreditation Status | |||
| Full Accreditation | — | — | 49.3 |
| 1-Year Accreditation | — | — | 20.4 |
| Not Accredited | — | — | 30.3 |
| Region | |||
| Northeast | — | — | 5.0 |
| North Mid-Atlantic | — | — | 9.5 |
| Mid-Atlantic | — | — | 9.0 |
| South Atlantic | — | — | 17.1 |
| Upper Midwest | — | — | 21.6 |
| Southwest | — | — | 12.6 |
| Pacific | — | — | 18.5 |
| Northwest | — | — | 6.8 |
| Persons in Respondent's ZIP Code Area | |||
| Black | — | — | 10.8 |
| Asian | — | — | 2.8 |
| 4-Year College Degree or Higher | — | — | 26.6 |
| Live in Poverty (Age 65 or Over) | — | — | 6.7 |
| Live in Poverty (All Ages) | — | — | 8.4 |
| Live in Urban Area | — | — | 84.5 |
| High-Status Occupation | — | — | 23.3 |
NOTE: n=208.
SOURCES: (InterStudy®, 1998; U.S. Bureau of the Census, 1990); Centers for Medicare & Medicaid Services: Data from the Group Health Plan Provider File, 1998.