Characteristics | Total (n = 148) | Class 1b (n = 58) | Class 2 (n = 46) | Class 3 (n = 44) |
---|---|---|---|---|
Age, years, mean ± standard deviation | 51 ± 11 | 50 ± 12 | 54 ± 10 | 50 ± 12 |
Gender male | 81 (55.5) | 37 (64.9) | 26 (57.8) | 18 (41.9) |
Professional background | ||||
Medical/surgical physician | 48 (32.7) | 23 (40.3) | 13 (28.9) | 12 (27.3) |
Statistician/epidemiologist | 20 (13.6) | 7 (12.3) | 7 (15.6) | 6 (13.6) |
Philosopher/ethicist | 13 (8.8) | 4 (7.0) | 2 (4.4) | 7 (15.9) |
Other a | 66 (44.9) | 23 (40.3) | 23 (51.1) | 19 (42.2) |
Involved in: | ||||
Planning an RCT | 93 (62.8) | 39 (67.2) | 29 (63.0) | 25 (56.8) |
Planning an unbalanced RCT | 30 (34.9) | 7 (18.4) | 16 (55.2) | 7 (31.8)* |
Approving an unbalanced RCT | 74 (54.0) | 26 (45.6) | 24 (53.3) | 24 (54.6) |
Unbalanced randomization raises problems | 19 (27.1) | 13 (50.0) | 3 (12.5) | 3 (12.5)* |
Agree to participate in an unbalanced RCT | 63 (81.8) | 15 (25.9) | 25 (54.4) | 23 (52.3)* |