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Table 3 Baseline and end of study measurements of categorized body mass indices 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

Body mass index classification    Baseline (% (n)) End of study (% (n)) Change (%) Baseline vs end of study ( P value) Intervention vs control ( P value)
Underweight Intervention Boys 1.65 (10) 1.20 (8) −0.45 0.636 0.768
   Girls 0.69 (4) 1.42 (9) 0.73 0.270 0.014
   Total 1.18 (14) 1.31 (17) 0.13 0.857 0.030
  Control Boys 0.89 (3) 0.34 (1) −0.55 0.627  
   Girls 2.43 (9) 1.87 (6) −0.56 0.795  
   Total 1.69 (12) 1.13 (7) −0.56 0.490  
Normal weight Intervention Boys 66.78 (404) 67.47 (449) 0.69 0.811 <0.001
   Girls 70.81 (410) 71.36 (451) 0.55 0.849 0.385
   Total 68.75 (814) 69.37 (899) 0.62 0.761 <0.001
  Control Boys 80.77 (273) 67.00 (199) −13.77 < 0.001  
   Girls 72.43 (268) 69.78 (224) −2.65 0.450  
   Total 76.41 (541) 68.45 (423) −7.96 0.0013  
Overweight Intervention Boys 21.98 (133) 24.10 (160) 2.12 0.386 0.001
   Girls 20.03 (116) 20.41 (129) 0.38 0.886 0.292
   Total 21.03 (249) 22.30 (289) 1.27 0.465 0.001
  Control Boys 10.95 (37) 23.23 (69) 12.28 < 0.001  
   Girls 17.57 (65) 21.81 (70) 4.24 0.178  
   Total 14.41 (102) 22.49 (139) 8.08 < 0.001  
Obese Intervention Boys 9.59 (58) 7.23 (48) −2.36 0.155 0.016
   Girls 8.46 (49) 6.80 (43) −1.66 0.280 0.762
   Total 9.04 (107) 7.02 (91) −2.02 0.075 0.047
  Control Boys 7.40 (25) 9.43 (28) 2.03 0.390  
   Girls 7.57 (28) 6.54 (21) −1.03 0.657  
   Total 7.49 (53) 7.93 (49) 0.44 0.836  
  1. Prevalence of obesity and overweight were categorized using the cut-off criteria proposed by the International Obesity Task Force [24]. Prevalence of underweight was analyzed according to Cole et al. [25] using 17 kg/m2 as the cut-off point. Categorical outcomes were analyzed using generalized linear models. Analyses were performed with the modified intention-to-treat analysis.