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Table 3 Relationships between hip aBMD and lean mass stratified by fat mass tertiles, correspondingly; fat mass stratified by lean mass tertiles, given per SD change and displayed as g/cm2. For girls and boys 15–17 years of age. The Tromsø Study, Fit Futures 1

From: Bone mineral density at the hip and its relation to fat mass and lean mass in adolescents: the Tromsø Study, Fit Futures

    GIRLS n = 395 BOYS n = 363
    Unadjusted Adjusteda Unadjusted Adjusteda
   n Beta p Beta p n Beta p Beta p
Femoral neck
Lean Mass (SD) FM - Low 132 0.069 < 0.001 0.087 < 0.001 121 0.080 < 0.001 0.073 < 0.001
FM - Medium 132 0.061 < 0.001 0.049 0.002 121 0.102 < 0.001 0.095 < 0.001
FM - High 131 0.036 < 0.001 0.035 0.002 121 0.067 < 0.001 0.063 < 0.001
Fat Mass (SD) LM - Low 132 0.040 0.006 0.038 0.009 121 0.019 0.215 0.040 0.010
LM - Medium 132 0.022 0.067 0.030 0.017 120 0.006 0.633 0.017 0.180
LM - High 131 0.012 0.144 0.024 0.009 122 −0.014 0.154 0.003 0.776
Total hip
Lean Mass (SD) FM - Low 132 0.062 < 0.001 0.088 < 0.001 121 0.074 < 0.001 0.065 < 0.001
LM - Medium 132 0.061 < 0.001 0.056 < 0.001 121 0.096 < 0.001 0.105 < 0.001
FM - High 131 0.025 0.008 0.034 0.003 121 0.063 < 0.001 0.069 < 0.001
Fat Mass (SD) LM - Low 132 0.045 0.002 0.045 0.002 121 0.018 0.268 0.041 0.009
LM - Medium 132 0.023 0.052 0.026 0.032 120 −0.004 0.734 0.008 0.516
LM - High 131 0.016 0.065 0.030 0.001 122 −0.009 0.360 0.010 0.366
  1. aAdjusted for age, height, sexual maturity, physical activity levels, calcium intake, vitamin D levels, alcohol consumption and smoking habits
  2. Girls: FM-Low; ≤ 15.48 kg, FM-Medium; 15.49–21.01 kg, FM-High; ≥ 21.02 kg
  3. LM-Low; ≤ 36.75 kg, LM-Medium; 36.76–40.31 kg, LM-High; ≥ 40.32 kg
  4. Boys: FM-Low; ≤ 8.04 kg, FM-Medium; 8.05–15.29 kg, FM-High; ≥ 15.30 kg
  5. LM-Low; ≤ 50.88 kg, LM-Medium; 50.89–56.41 kg, LM-High; ≥ 56.42 kg