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Table 2 Baseline characteristics by BMI status (normal weight, underweight and overweight)a

From: Two years of school-based intervention program could improve the physical fitness among Ecuadorian adolescents at health risk: subgroups analysis from a cluster-randomized trial

  P b All Normal weight Underweight Overweight
   n Control Mean (SD) Intervention Mean (SD) n Control Mean (SD) Intervention Mean (SD) n Control Mean (SD) Intervention Mean (SD) n
Age 0.04 1292 12.91 (0.82) 12.80 (0.75) 1014 13.05 (0.84) 12.89 (0.84) 79 12.77 (0.78) 12.75 (0.79) 278
Body mass index (kg/m2) <0.001 1292 18.79 (1.67) 18.79 (1.65) 1014 15.51 (0.83) 15.20 (0.73) 79 24.24 (2.04) 24.90 (2.81) 278
Body mass index Z-score <0.001 1292 0.06 (0.64) 0.07 (0.68) 1014 −1.66 (0.40) −1.80 (0.43) 79 1.73 (0.43) 1.84 (0.52) 278
Low socio economic status (%) 0.03 1240 34.56 32.78 971 29.41 41.46 75 26.36 25.00 269
Female proportion (%) 0.78 1292 58.30 66.73 1014 61.76 60.00 66 58.52 68.53 278
Fitness (EUROFIT)            
Speed-agility            
Speed shuttle run (s) <0.001 1257 24.37 (2.14) 24.44 (2.28) 987 24.52 (2.82) 23.86 (2.80) 76 25.16 (2.08) 25.63 (2.37) 270
Muscle strength and endurance            
Vertical jump (cm) <0.001 1259 26.51 (5.41) 25.86 (5.70) 991 25.23 (5.54) 26.19 (4.88) 76 24.21 (4.96) 23.66 (5.34) 268
Accelerometer data            
% who meet the PA recommendation (60 min MVPA/day) 0.29 225 91.02 96.70 169 100 85.71 11 91.30 90.90 45
  1. aThe overweight group includes overweight and obese adolescents according to the IOTF criteria [30]
  2. bP-value for differences between overweight, normal-weight and underweight groups
  3. The analysis was adjusted for the study design