Table 1. Demographic characteristics of the sample of schoolchildren participated in the study.
| Grade level | N |
Age (years) Mean (SD) |
Weight (kg) Mean (SD) |
Height (cm) Mean (SD) |
Body mass index (kg/m2) Mean (SD) |
|
| Grade one | Boys | 31 | 7.3 (0.47) | 24.2 (3.20) | 123.8 (6.23) | 15.7 (1.62) |
| Girls | 29 | 7.3 (0.48) | 23.6 (4.85) | 123.0 (6.96) | 15.4 (1.87) | |
| Grade two | Boys | 29 | 8.2 (0.43) | 27.2 (7.46) | 128.6 (5.70) | 16.3 (3.42) |
| Girls | 30 | 8.3 (0.48) | 28.0 (6.66) | 128.3 (5.74) | 16.8 (3.06) | |
| Grade three | Boys | 33 | 9.2 (0.48) | 30.1 (8.23) | 135.1 (6.11) | 16.4 (3.43) |
| Girls | 29 | 9.3 (0.54) | 29.0 (6.35) | 133.5 (7.41) | 16.1 (2.84) | |
| Grade four | Boys | 31 | 10.5 (0.56) | 35.3 (9.41) | 139.6 (6.49) | 17.9 (3.70) |
| Girls | 33 | 10.3 (0.58) | 33.1 (9.73) | 137.8 (7.77) | 17.2 (3.49) | |
| Grade five | Boys | 29 | 11.3 (0.48) | 41.6 (11.76) | 147.4 (6.34) | 19.0 (4.48) |
| Girls | 33 | 11.4 (0.56) | 39.3 (10.55) | 147.2 (7.42) | 17.9 (3.56) | |
| All | 307 | 9.3 (1.53) | 31.2 (9.97) | 134.6 (10.55) | 16.9 (3.38) |