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Table 1 Participant characteristics at baseline by study arm (N = 1981). Results are presented as mean (SD) unless otherwise stated

From: The effect of a school-based intervention on physical activity, cardiorespiratory fitness and muscle strength: the School in Motion cluster randomized trial

  PAL-group DWBH-group Control
N 647 577 757
Age (years) 13.9 (0.3) 14.0 (0.3) 14.0 (0.3)
Sex (% girls/boys) 50/50 49/51 49/50
Height (cm) 164.6 (8.1) 166.4 (7.7) 165.8 (7.7)
Weight (kg) 54.2 (10.8) 56.2 (11.0) 54.4 (10.5)
BMI (kg/m2) 19.9 (3.1) 20.2 (3.2) 19.7 (3.1)
Socioeconomic statusa
 Primary school (%) 6.5 6.5 5.0
 Upper Secondary school (%) 27.1 31.5 28.3
 University < 4 years (%) 42.8 39.4 41.6
 University > 4 years (%) 23.6 22.5 25.1
  1. PAL Physically active learning; DWBH Don’t Worry – Be Happy, BMI Body mass index
  2. aBased on parental education