Table 2 Associations between levels of physical activity outside school hours and bone mineral density and content in Norwegian girls 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 | 0.031 [0.008, 0.055] | 0.033 [0.009, 0.057] | 0.016 [0.003, 0.029] | 0.138 [0.020, 0.255] | 0.789 [−0.011, 1.589] | 18.901 [−30.260, 68.062] |
High | 0.093 [0.066, 0.121] | 0.090 [0.062, 0.117] | 0.046 [0.031, 0.062] | 0.477 [0.339, 0.615] | 2.879 [1.942, 3.816] | 98.972 [41.055, 156.889] |
Model 2 | ||||||
Seldom | Reference | |||||
Moderate | 0.026 [0.002, 0.050] | 0.028 [0.004, 0.052] | 0.012 [−0.001, 0.026] | 0.094 [−0.025, 0.213] | 0.671 [−0.154, 1.495] | 7.138 [−43.040, 57.316] |
High | 0.094 [0.066, 0.122] | 0.092 [0.063, 0.121] | 0.048 [0.033, 0.064] | 0.464 [0.322, 0.606] | 2.961 [1.980, 3.942] | 100.618 [40.517,160.718] |
Physical Activity Intensity | ||||||
Model 1 | ||||||
Not hard | Reference | |||||
Quite hard | 0.036 [0.011, 0.061] | 0.029 [0.004, 0.054] | 0.022 [0.008, 0.036] | 0.190 [0.064, 0.316] | 1.012 [0.161, 1.862] | 39.536 [−12.725, 91.798] |
Hard | 0.066 [0.041, 0.091] | 0.069 [0.043, 0.094] | 0.031 [0.017, 0.046] | 0.339 [0.213, 0.466] | 2.170 [1.314, 3.027] | 51.061 [−1.817, 103.940] |
Model 2 | ||||||
Not hard | Reference | |||||
Quite hard | 0.031 [0.006, 0.057] | 0.026 [0.000, 0.52] | 0.018 [0.004, 0.032] | 0.149 [0.021, 0.277] | 0.966 [0.085, 1.846] | 29.257 [−24.215, 82.729] |
Hard | 0.058 [0.032, 0.084] | 0.062 [0.035, 0.088] | 0.026 [0.011, 0.040] | 0.285 [0.155, 0.416] | 2.029 [1.135, 2.922] | 34.902 [−19.689, 89.494] |