Table 3.
Baseline and end of study measurements of categorized body mass indices in the intervention and control groups
| 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 |
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.