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Table 4 Secondary outcomes (body mass index z-score, waist circumference and body mass index) at baseline and at the end of the study in the intervention and control groups

From: A primary-school-based study to reduce the prevalence of childhood obesity – the EdAl (Educació en Alimentació) study: a randomized controlled trial

    Baseline (mean (95% CI)) End of study (mean (95% CI)) Baseline vs end of study ( P value) Intervention vs control ( P value)
Body mass index z-score Intervention Boys 0.01 (−0.07, 0.10) −0.04 (−0.11, 0.04) 0.367 <0.001
   Girls 0.00 (−0.08, 0.08) −0.01 (−0.09, 0.06) 0.755 <0.001
   Total 0.05 (−0.01, 0.11) −0.03 (−0.08, 0.03) 0.388 <0.001
  Control Boys −0.10 (−0.20, 0.00) 0.09 (−0.03, 0.21) 0.015  
   Girls −0.02 (−0.12, 0.08) −0.03 (−0.14, 0.08) 0.941  
   Total −0.11 (−0.18, -0.04) 0.01 (−0.07, 0.09) 0.105  
Waist circumference (cm) Intervention Boys 60.69 (60.07, 61.30) 67.44 (66.73, 68.16) <0.001 0.269
   Girls 58.98 (58.39, 59.57) 65.96 (65.24, 66.67) <0.001 0.108
   Total 59.85 (59.42, 60.28) 66.72 (66.21, 67.22) <0.001 0.043
  Control Boys 59.80 (59.04, 60.57) 66.39 (65.39, 67.38) <0.001  
   Girls 60.04 (59.20, 60.88) 66.10 (65.10, 67.10) <0.001  
   Total 59.93 (59.36, 60.50) 66.24 (65.54, 66.94) <0.001  
Body mass index (kg/m2) Intervention Boys 17.73 (17.48, 17.97) 18.86 (18.60, 19.13) <0.001 0.442
   Girls 17.65 (17.39, 17.91) 18.76 (18.49, 19.04) <0.001 0.596
   Total 17.69 (17.51, 17.87) 18.82 (18.63, 19.01) <0.001 0.381
  Control Boys 17.00 (16.71, 17.30) 18.48 (18.10, 18.86) <0.001  
   Girls 17.17 (16.85, 17.48) 18.28 (17.92, 18.64) <0.001  
   Total 17.09 (16.87, 17.30) 18.38 (18.12, 18.64) 0.001  
  1. Continuous outcomes were analyzed through mixed models of repeated measures. Analyses were performed with the modified intention-to-treat analysis.