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Table 3 Multiple median regression analysis for bone material properties

From: At the moment of occurrence of a fragility hip fracture, men have higher mechanical properties values in comparison with women

Variables Age Gender
Measure βa 95% Confidence Interval p- valueb βa 95% Confidence Interval p- valueb
Ultimate stress, σ ULT [MPa] 0.02 -0.11 <  β < 0.16 0.72 -2.29 -5.43 < β < 0.86 0.15
Young’s modulus, E [MPa] -6.10 -12.54 < β < 0.34 0.06 -97.72 -216.06 < β < 20.62 0.10
Energy to failure, W ULT [MJ/m3] 0.01 0.00 < β < 0.02 0.01 -0.09 -0.22 <  β < 0.03 0.13
Variables Age-group Gender
Ultimate stress, σ ULT [MPa] 0.57 -0.68 <  β < 1.81 0.37 -2.00 -5.27 < β < 1.27 0.23
Young’s modulus, E [MPa] -34.89 -124.20 <  β < 54.42 0.44 -104.49 -238.15 < β < 29.17 0.12
Energy to failure, W ULT [MJ/m3] 0.09 0.02 < β < 0.16 0.02 -0.13 -0.25 < β < -0.01 0.04
  1. aCoefficients obtained by QUANTREG procedure.
  2. bStatistical significance p < 0.05.
  3. Note: Two multiple median regression models were performed. In the first model, each bone material property (the dependent variable) was analysed with age and gender as covariate variables. In the second model, these bone material parameters were analysed with age-group and gender as covariate variables.