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Table 2 Design features of SW-CRCTs

From: Stepped wedge cluster randomized controlled trial designs: a review of reporting quality and design features

  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    
 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