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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.