Table 2.
Factors Associated with Participation and Randomization
| NP | CP (n = 42) | IP (n = 57) | CP + IP | CP vs. IP | CP + IP vs. NP | |
|---|---|---|---|---|---|---|
| Sex, female | 359 (39.7) | 24 (57.1) | 28 (52.8) | 5 (54.7) | 0.69 | <0.01 |
| Age, y | 0.69 | 0.13 | ||||
| 30–40 | 251 (28.5) | 12 (28.6) | 11 (19.3) | 23 (23.2) | ||
| 41–50 | 314 (35.6) | 14 (33.3) | 21 (36.8) | 35 (35.4) | ||
| 51–60 | 225 (25.5) | 11 (26.2) | 15 (26.3) | 26 (26.3) | ||
| 61+ | 91 (10.3) | 5 (11.9) | 10 (17.5) | 15 (15.2) | ||
| Ethnicity | 0.14 | NA | ||||
| African-American | NA | 9 (21.4) | 3 (5.26) | |||
| Asian | 8 (19.1) | 17 (29.8) | ||||
| Caucasian | 21 (50.0) | 31 (54.4) | ||||
| Hispanic | 3 (7.1) | 2 (1.75) | ||||
| Other | 1 (2.4) | 4 (5.26) | ||||
| Provider Type | 0.36 | 0.05 | ||||
| Family practice | 310 (28.5) | 8 (19.1) | 9 (15.8) | 17 (17.2) | ||
| Pediatric | 708 (65.1) | 30 (71.4) | 46 (80.7) | 76 (76.8) | ||
| Type of employment | 0.44 | 0.13 | ||||
| Direct patient care | 811 (94.3) | 34 (91.9) | 47 (97.8) | 81 (95.3) | ||
| Employment | NA | |||||
| Private practice | 27 (65.9) | 41 (78.9) | ||||
| Public Health | NA | 5 (12.2) | 1 (1.9) | |||
| Hospital | 4 (9.8) | 7 (13.5) | ||||
| Other | 5 (12.2) | 3 (5.8) | ||||
| State | 0.96 | <0.01 | ||||
| Alabama | 367 (33.7) | 23 (54.8) | 30 (52.6) | 53 (53.5) | ||
| Illinois* | 461 (42.4) | 13 (30.1) | 19 (33.3) | 32 (32.3) | ||
| South Carolina | 260 (23.9) | 8 (14.3) | 8 (14.0) | 16 (16.2) | ||
| Year graduation from med school | 1986 | 1984 | 1982 | 1983 | 0.30 | <0.01 |
| % Medicaid | NA | 53.6% | 44.7% | 0.07 | NA | |
| WCC claims (mean) | 72 | 112 | 85 | 96 | 0.06 | <0.01 |
| VS rate | 0.14 | 0.18 | 0.17 | 0.18 | 0.84 | 0.16 |
Data are n (%).
*
Illinois enrollment was stopped early, when recruitment goals were met.