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Table 1 The planned and effective allocation of the study groups separated by gender and wave

From: Promotion of physical activity-related health competence in physical education: study protocol for the GEKOS cluster randomized controlled trial

  Allocation ratio and planned number of PE classes Effective allocated number of participating PE classes after randomization (number of participating students)
Male Female
Wave IG-run : IG-game play :
CG-run : CG-game play
male/female classes IG-run (n) IG-game play (n) CG-run (n) CG-game play (n) Total IG-run (n) IG-game play (n) CG-run (n) CG-game play (n) Total
Wave 1 1:1:1:1 8/8 2 (24) 2 (30) 2 (24) 2 (33) 8 2 (45) 2 (34) 2 (25) 2 (31) 8
Wave 2 3:3:1:1 8/8 2 (33) 2 (41) 0 (0) 1 (23) 5a 3b,c (56) 2b (39) 0b (0) 1 (24) 6
Wave 3 1:1:1:1 8/8 3 (55) 2 (35) 3 (50) 3 (63) 11d 2 (42) 3 (57) 3 (51) 2 (45) 10d
Sum 48 7 (112) 6 (106) 5 (74) 6 (119) 24 7 (143) 7 (130) 5 (76) 5 (100) 24
  1. aAs the recruitment rate had been lower than expected, randomization was conducted with five classes and three additional dummy classes to compensate for the absent three male PE classes
  2. bAfter randomization three female classes allocated to IG-run, IG-game play and CG-run canceled their participation. Therefore, they are not considered in the labeled columns
  3. cOne female PE teacher could be recruited after randomization. She was allocated to the group of PE teacher who canceled her participation at first (IG-run)
  4. dIn addition to the listed number of PE classes one male and two female dummy classes were added to randomization to guarantee equal allocation ratio