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Table 4 Changes in BMI and overweight/obesity prevalence in intervention and control groups

From: Effectiveness of a school-based physical activity intervention on obesity in school children: a nonrandomized controlled trial

  Intervention group Control group
  (N = 388) (N = 533)
Body mass index, kg/m2
Baseline, mean (SD) 19.12 (4.28) 19.93 (4.47)
Follow-up, mean (SD) 19.10 (4.08) 20.33 (4.59)
Mean change (SE) −0.02 (0.06) 0.41 (0.08)
Adjusted difference, mean (95% CI)a −0.43 (−0.63 to −0.23)
P value <0.001
Overweight/obesity
Baseline, % 33.0 39.6
Follow-up, % 30.7 41.3
Change, % −2.3 1.7
Change difference, % −4.0
Adjusted OR (95% CI)bc 0.84 (0.56 to 1.24)
P value 0.370
  1. aAdjusted difference was calculated using multilevel model adjusted for sex and age.
  2. bAdjusted odds ratio was calculated using logistic regression model adjusted for sex and age.
  3. cOR: The risk of becoming overweight or obesity in the intervention group was 0.84 times more than children in the control group, showing a reduction of 16.0% the risk of being overweight or obese.