Table 2. Sample Characteristics for Forced Choice Return to Fee-for-Serice (FFS) Treatment Population Compared to Continuous Health Maintenance Organization (HMO) and Voluntary Return to FFS: 1998.
| Characteristic | Forced Withdrawal Return to FFS | Continuous HMO | Voluntary Return to FFS |
|---|---|---|---|
| Observations | 1,386 | 70,585 | 1,165 |
| Percent | |||
| Average Age | 72.2 | 72.8 -(2.20) |
72.5 -(0.02) |
| 65-70 Years | 0.400 | 0.353 (3.40) |
0.404 -(0.38) |
| 70-75 Years | 0.272 | 0.300 -(2.19) |
0.257 (0.87) |
| 75-85 Years | 0.281 | 0.297 -(1.35) |
0.292 -(0.62) |
| 85 Years or Over | 0.050 | 0.050 -(0.02) |
0.046 (0.40) |
| Male | 0.523 | 0.493 (2.25) |
0.505 (0.88) |
| White Persons | 0.882 | 0.889 -(0.80) |
0.873 (0.67) |
| Average Number of Ambulatory Diagnostic Groups | 5.32 | 4.62 (7.88) |
5.85 -(3.77) |
| None | 0.097 | 0.092 (0.59) |
0.052 (4.21) |
| 1-5 | 0.462 | 0.555 -(6.90) |
0.439 (1.17) |
| 6-10 | 0.352 | 0.300 (4.16) |
0.418 -(3.42) |
| > Than 10 | 0.089 | 0.053 (5.98) |
0.091 -(0.13) |
NOTES: In parentheses are the t-statistics for comparison of means between the treatment population and the two comparison populations.
SOURCE: Robert Wood Johnson Foundation: Data from the 1999 Medicare Health Maintenance Organization Closure Study.