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Table 2 Participant characteristics by group allocation at baseline. Mean (SD) unless other stated.

From: Effects of a school-based physical activity intervention on academic performance in 14-year old adolescents: a cluster randomized controlled trial – the School in Motion study

  PAL Intervention
(n = 536–655)
DWBH Intervention
(n = 427–586)
Control
(n = 583–795)
Girls Boys Girls Boys Girls Boys
N 328 327 286 300 387 408
Age (year) 13.9 (0.3) 13.9 (0.3) 13.9 (0.3) 14.0 (0.3) 14.0 (0.3) 14.0 (0.3)
Parents education levels
 Low (%) 5.8 7.0 5.2 7.6 2.5 7.1
 Middle (%) 26.5 27.0 30.0 32.3 26.8 29.0
 Middle high (%) 42.4 42.2 43.7 34.7 43.2 39.0
 High (%) 23.8 22.9 20.2 24.3 26.1 23.5
Anthropometry
 Height (cm) 162.9 (6.2) 166.3 (9.4) 164.1 (6.1) 168.6 (8.4) 163.9 (6.5) 167.6 (8.3)
 Weight (kg) 54.3 (9.6) 54.1 (11.8) 55.9 (10.2) 56.5 (11.7) 54.2 (9.3) 54.6 (11.5)
Physical activity levels full day
 Total PA (cpm) 473.2 (157.3) 552.1 (207.0) 512.8 (204.5) 563.7 (204.7) 510.5 (174.7) 590.1 (227.1)
 MVPA (min/day) 64.5 (21.8) 71.6 (25.8) 69.6 (25.0) 73.3 (28.0) 69.7 (25.5) 77.8 (30.3)
 Sedentary (min/day) 560.0 (69.9) 530.3 (86.7) 551.3 (75.4) 521.7 (80.6) 545.9 (72.0) 513.9 (82.9)
Academic performance
 Numeracy (points) 53.5 (9.8) 56.4 (9.8) 54.2 (9.3) 55.3 (9.4) 56.1 (9.9) 55.2 (10.1)
 Reading (points) 56.5 (9.7) 54.2 (9.7) 55.8 (9.6) 53.0 (10.2) 57.5 (9.7) 52.7 (10.3)
  1. PAL = Physical active learning; DWBH = Don’t worry – Be happy”. PA = physical activity; MVPA = moderate-to-vigorous intensity physical activity