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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

From: Does the frequency and intensity of physical activity in adolescence have an impact on bone? 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]
  1. Model 1: adjusted for age, weight, height
  2. Model 2: Model 1 + sexual maturation, smoking status, alcohol intake
  3. Values significant at p < 0.05 in Italic, values significant at p < 0.001 in Italic Bold