| Study population | Dropout population | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Baseline | Follow-up | aBaseline vs follow-up | Baseline | bStudy vs dropout populations | |||||||
Boys, N = 121 | Girls, N=133 | bBoys vs girls | Boys, N = 121 | Girls, N = 133 | Boys | Girls | Boys, N = 81 | Girls, N = 73 | Boys | Girls | |
Age (years) | 11.2 ± 0.3 | 11.2 ± 0.3 | ns | 14.2 ± 0.3 | 14.2 ± 0.3 | < 0.001 | < 0.001 | 11.2 ± 0.3 | 11.2 ± 0.3 | ns | ns |
Height (cm) | 141 ± 6 | 143 ± 7 | 0.007 | 162 ± 6 | 155 ± 5 | < 0.001 | < 0.001 | 142 ± 6 | 143 ± 7 | ns | ns |
Weight (kg) | 34.7 ± 7.4 | 35.1 ± 5.9 | ns | 49.9 ± 8.4 | 47.0 ± 5.8 | < 0.001 | < 0.001 | 35.4 ± 7.1 | 35.5 ± 8.7 | ns | ns |
TBLH BMC (g) | 644 ± 140 | 700 ± 162 | 0.003 | 1143 ± 251 | 1044 ± 180 | < 0.001 | < 0.001 | 656 ± 121 | 690 ± 178 | ns | ns |
TB bone area (cm2) | 1288 ± 174 | 1336 ± 186 | 0.036 | 1789 ± 211 | 1680 ± 153 | < 0.001 | < 0.001 | 1305 ± 155 | 1329 ± 195 | ns | ns |
TBLH aBMD (g/cm2) | 0.609 ± 0.040 | 0.624 ± 0.050 | 0.005 | 0.739 ± 0.074 | 0.720 ± 0.062 | < 0.001 | < 0.001 | 0.613 ± 0.037 | 0.618 ± 0.057 | ns | ns |
TB BMAD (g/cm3) | 0.081 ± 0.008 | 0.080 ± 0.006 | ns | 0.075 ± 0.004 | 0.078 ± 0.005 | < 0.001 | 0.003 | 0.081 ± 0.007 | 0.080 ± 0.007 | ns | ns |
25-hydroxyvitamin D (ng/mL) | 34.3 ± 7.8 | 29.6 ± 7.7 | < 0.001 |  |  |  |  |  |  |  |  |
IGF-I (ng/mL) | 198 ± 80 | 281 ± 81 | < 0.001 |  |  |  |  |  |  |  |  |
Sedentary behavior (media use), N (%) | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
< 1 h/day | 29 (24) | 33 (25) | ns |  |  |  |  |  |  |  |  |
≥1, < 2 h/day | 54 (45) | 63 (47) |  |  |  |  |  |  |  |  | |
≥ 2, < 3 h/day | 20 (17) | 29 (22) |  |  |  |  |  |  |  |  | |
≥ 3, < 4 h/day | 11 (9) | 6 (5) |  |  |  |  |  |  |  |  | |
≥ 4 h/day | 7 (6) | 2 (2) |  |  |  |  |  |  |  |  | |
Pubic hair appearance, N (%) | |||||||||||
<Grade 5 | 0 (0) | 10 (8) | < 0.001 |  |  |  |  |  |  |  |  |
Grade 5 | 8 (7) | 36 (27) | Â | Â | Â | Â | Â | Â | Â | Â | |
No appearance | 113 (93) | 87 (65) | Â | Â | Â | Â | Â | Â | Â | Â |