Table 3 Associations between levels of physical activity outside school hours and bone mineral density and content in Norwegian boys 15–18 years. The Tromsø Study, Fit Futures
BMD (β coefficient [95 % CI]) | BMC (β coefficient [95 % CI]) | |||||
|---|---|---|---|---|---|---|
Femoral neck | Total hip | Total body | Femoral neck | Total hip | Total body | |
Physical Activity Frequency (Days a week) | ||||||
Model 1 | ||||||
Seldom | Reference | |||||
Moderate | 0.034 [0.008, 0.060] | 0.041 [0.015, 0.068] | 0.019 [0.003, 0.034] | 0.241 [0.077, 0.404] | 1.652 [0.588, 2.716] | 65.921 [7.096, 124.747] |
High | 0.125 [0.096, 0.154] | 0.133 [0.103, 0.162] | 0.066 [0.049, 0.083] | 0.779 [0.599, 0.959] | 5.134 [3.962, 6.306] | 234.404 [169.38, 299.425] |
Model 2 | ||||||
Seldom | Reference | |||||
Moderate | 0.029 [0.002, 0.056] | 0.037 [0.010, 0.064] | 0.017 [0.001, 0.033] | 0.220 [0.054, 0.386] | 1.544 [0.463, 2.626] | 59.838 [−0.095, 119.771] |
High | 0.125 [0.095, 0.155] | 0.132 [0.102, 0.161] | 0.067 [0.049, 0.084] | 0.797 [0.613, 0.980] | 5.172 [3.976, 6.368] | 241.298 [174.753, 307.843] |
Physical Activity Intensity | ||||||
Model 1 | ||||||
Not hard | Reference | |||||
Quite hard | 0.042 [0.014, 0.070] | 0.052 [0.024, 0.080] | 0.023 [0.007, 0.040] | 0.311 [0.136, 0.486] | 2.068 [0.925, 3.212] | 85.706 [23.172, 148.241] |
Hard | 0.109 [0.081, 0.137] | 0.113 [0.085, 0.141] | 0.058 [0.042, 0.075] | 0.671 [0.497, 0.845] | 4.302 [3.166, 5.438] | 209.455 [146.958, 271.952] |
Model 2 | ||||||
Not hard | Reference | |||||
Quite hard | 0.033 [0.005, 0.061] | 0.045 [0.017, 0.074] | 0.020 [0.003, 0.036] | 0.266 [0.091, 0.442] | 1.817 [0.674, 2.959] | 73.031 [10.216, 135.846] |
Hard | 0.105 [0.076, 0.133] | 0.109 [0.080, 0.137] | 0.055 [0.038, 0.072] | 0.658 [0.481, 0.835] | 4.191 [3.043, 5.340] | 199.326 [136.122, 262.529] |