Table 1 Baseline characteristics and bone mineral density (BMD) and contents (BMC) levels at different sites by status of physical activity outside school hours. The Tromsø Study, Fit Futures
Inactive | Active | Mean Δ (Choen`s d) | |||
|---|---|---|---|---|---|
N | Mean (SD) | N | Mean (SD) | ||
Girls | |||||
Age (years) | 166 | 16.6 (1.5) | 333 | 16.3 (1.2) | |
Height (cm) | 164 | 163.7 (7.00) | 333 | 165.2 (6.36) | |
Weight (kg) | 164 | 61.4 (13.4) | 333 | 61.3 (11.6) | |
BMI (kg/m2) | 164 | 22.9 (4.5) | 333 | 22.5 (4.1) | |
Smoking | 166 | 332 | |||
Daily | 12.7 % | 2.1 % | |||
Sometimes | 20.6 % | 13.9 % | |||
No, never | 66.7 % | 84.0 % | |||
Alcohol | 166 | 333 | |||
Never | 23.5 % | 24.0 % | |||
≤1/month | 38.6 % | 48.9 % | |||
≥2/month | 37.9 % | 27.1 % | |||
FN-BMD (g/cm2) | 156 | 1.030 (0.113) | 331 | 1.084 (0.124) | −0.054 (0.53) |
TH-BMD (g/cm2) | 151 | 1.025 (0.112) | 329 | 1.077 (0.127) | −0.053 (0.51) |
TB-BMD (g/cm2) | 163 | 1.125 (0.076) | 332 | 1.151 (0.076) | −0.026 (0.40) |
FN-BMC (g) | 156 | 4.727 (0.662) | 331 | 5.008 (0.714) | −0.282 (0.47) |
TH-BMC (g) | 151 | 30.79 (4.63) | 329 | 32.61 (4.89) | −1.820 (0.45) |
TB-BMC (g) | 163 | 2493.0 (439.6) | 332 | 2555.4 (381.3) | −62.40 (0.18) |
Boys | |||||
Age (years) | 177 | 16.2 (0.8) | 343 | 16.3 (1.2) | |
Height (cm) | 177 | 176.3 (6.8) | 343 | 177.3 (6.5) | |
Weight (kg) | 177 | 71.4 (17.3) | 343 | 70.2 (13.0) | |
BMI (kg/m2) | 177 | 22.9 (5.1) | 343 | 22.3 (3.7) | |
Smoking | 177 | 343 | |||
Daily | 6.2 % | 2.6 % | |||
Sometimes | 27.1 % | 17.2 % | |||
No, never | 66.7 % | 80.2 % | |||
Alcohol | 175 | 343 | |||
Never | 31.4 % | 30.9 % | |||
≤1/month | 33.1 % | 39.4 % | |||
≥2/month | 35.4 % | 29.8 % | |||
FN-BMD (g/cm2) | 173 | 1.057 (0.140) | 339 | 1.129 (0.150) | −0.072 (0.56) |
TH-BMD (g/cm2) | 170 | 1.064 (0.140) | 333 | 1.142 (0.147) | −0.078 (0.62) |
TB-BMD (g/cm2) | 175 | 1.157 (0.097) | 342 | 1.195 (0.094) | −0.037 (0.45) |
FN-BMC (g) | 173 | 5.639 (0.871) | 339 | 6.147 (1.019) | −0.508 (0.59) |
TH-BMC (g) | 170 | 37.83 (6.13) | 333 | 41.06 (6.60) | −3.239 (0.57) |
TB-BMC (g) | 175 | 2862.8 (461.8) | 342 | 3020.7 (479.3) | −157.9 (0.38) |