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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

From: Does the frequency and intensity of physical activity in adolescence have an impact on bone? 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)
  1. Values significant at p < 0.001 in Italic Bold