Table 2 Design features of SW-CRCTs
|  | Reports (N = 39) (%) | Others (N = 84) (%) | All (N = 123) (%) |
|---|---|---|---|
Design type | |||
 Continuous recruitment short exposure | 13 (33.3) | 35 (41.7) | 48 (39.0) |
 Open cohort | 12 (30.8) | 16 (19.0) | 28 (22.8) |
 Closed cohort | 12 (30.8) | 17 (20.2) | 29 (23.6) |
 Other | 1 (2.6) | 3 (3.6) | 4 (3.3) |
 Unclear | 1 (2.6) | 13 (15.5) | 14 (11.4) |
Steps | Â | Â | Â |
 2 | 2 (5.1) | 3 (3.6) | 5 (4.1) |
 3 | 1 (2.6) | 2 (2.4) | 3 (2.4) |
 4 | 1 (2.6) | 1 (1.2) | 2 (1.6) |
 5 | 11 (28.2) | 1 (1.2) | 12 (9.8) |
 6 | 1 (2.6) | 1 (1.2) | 2 (1.6) |
 7 | 3 (7.7) | 10 (11.9) | 13 (10.6) |
 8 | 1 (2.6) | 0 (0) | 1 (0.8) |
 9 | 7 (17.9) | 13 (15.5) | 20 (16.3) |
 10 | 4 (10.3) | 0 (0) | 4 (3.3) |
 11 | 5 (12.8) | 12 (14.3) | 17 (13.8) |
 12 | 1 (2.6) | 11 (13.1) | 12 (9.8) |
 13 | 1 (2.6) | 5 (6.0) | 6 (4.9) |
 14 | 0 (0) | 1 (1.2) | 1 (0.8) |
 15 | 0 (0) | 2 (2.4) | 2 (1.6) |
 16 | 0 (0) | 1 (1.2) | 1 (0.8) |
 Unclear | 1 (2.6) | 21 (25.0) | 22 (17.9) |
Total number of participants | Reports (N = 36) | Others (N = 72) | All (N = 108) |
 Minimum | 123.0 | 40.0 | 40.0 |
 Q1 | 368.8 | 400.0 | 400.0 |
 Median | 1112.0 | 1200.0 | 1200.0 |
 Q3 | 3264.8 | 6330.8 | 4000.0 |
 Maximum | 26456.0 | 256700.0 | 256700.0 |