Table 1 Characteristics of study participants at baseline (fourth grade) and 3 years later (seventh grade)
| Â | In fourth grade | In seventh grade | ||||
|---|---|---|---|---|---|---|
Boys (n = 720) | Girls (n = 716) | P valuea | Boys (n = 720) | Girls (n = 716) | P valuea | |
Age (years) | 9.0 (9.0, 10.0) | 9.0 (9.0, 10.0) | 0.764 | 12.0 (12.0, 12.0) | 12.0 (12.0, 12.0) | 0.142 |
Height (cm) | 134.9 (131.1, 139.0) | 134.4 (130.6, 139.5) | 0.397 | 153.6 (147.7, 158.8) | 152.2 (148.5, 156.0) | <Â 0.001 |
Weight (kg) | 30.3 (27.4, 34.9) | 29.5 (26.3, 34.0) | 0.001 | 42.5 (37.7, 48.5) | 42.6 (38.3, 47.4) | 1.000 |
Body mass index (kg/m2) | 16.7 (15.5, 18.5) | 16.2 (15.2, 17.8) | < 0.001 | 17.9 (16.7, 19.4) | 18.2 (17.0, 19.9) | 0.010 |
Waist circumference (cm) | 57.7 (54.4, 62.7) | 57.3 (54.3, 61.0) | 0.031 | 63.0 (59.6, 67.3) | 63.7 (60.0, 67.7) | 0.073 |
Waist-to-height ratio | 0.428 (0.407, 0.459) | 0.425 (0.407, 0.452) | 0.038 | 0.41 (0.39, 0.43) | 0.42 (0.40, 0.44) | <Â 0.001 |
Overweight/obesity | 125 (17.4) | 87 (12.2) | 0.005 | 82 (11.4) | 79 (11.0) | 0.831 |
Central obesity | 85 (11.8) | 57 (8.0) | 0.015 | 50 (6.9) | 47 (6.6) | 0.774 |