Prediction of Local Ultimate Strain and Toughness of Trabecular Bone Tissue by Raman Material Composition Analysis

Table 1

Results of the hierarchical multivariate regression analysis with the ultimate strain as the dependent variable and density (TMD), collagen cross-links (CCL), carbonate substitution ratio (CPR), and mineral-to-matrix ratio (MMR). Model 2 for tensile data and Model 1 for bending data include all variables that significantly contribute to the regression analysis.

	Tensile		Bending
	Model 1 (CCL)	Model 2 (CCL, CPR)	Model 1 (CCL)
Included variables	CCL	CCL, CPR	CCL
	0.808	0.876	0.843
Adjusted square	0.625	0.728	0.689
Standardised beta	0.808	0.505, −0.455	0.843
Excluded variables	CPR, TMD, and MMR	TMD, MMR	CPR, TMD, and MMR