Characteristics of Patients and Physicians Enrolled and Not Enrolled in the Study
| Characteristics | Not Enrolled | Enrolled |
|---|---|---|
| SD = standard deviation; ADGs = ambulatory diagnostic groups; MCO = managed care organization. | ||
| * Socioeconomic variables derived from patient Zip code linked to 1990 census data. | ||
| † From the pool of 594 physicians, 297 were eligible for recruitment; family physicians were over-sampled; cooperation rate was 33.7%. | ||
| Patient | ||
| Number | 483,094 | 121,806 |
| Age, years (SD) | 41.1 (11.2) | 41.0 (11.0) |
| Female sex, % | 52.7 | 53.9 |
| Median income, $ (SD)* | 36,874 (10,160) | 37,830 (10,683) |
| High-school graduation, % (SD)* | 63.8 (7.9) | 64.8 (7.8) |
| Any visit to a physician, % | 82.5 | 83.1 |
| Referred, % | 25.6 | 25.7 |
| Years enrolled in the MCO, No. (SD) | 3.07 (1.12) | 3.07 (1.12) |
| ADGs, mean No. (SD) | 2.99 (2.67) | 3.02 (2.67) |
| Physician | ||
| Number | 594 | 100† |
| Specialty, family practice, % | 24 | 47 |
| Patients enrolled in the MCO, No. (SD) | 813 (776) | 1218 (758) |