Skip to main content
. Author manuscript; available in PMC: 2009 Apr 1.
Published in final edited form as: Bone. 2007 Dec 28;42(4):743–750. doi: 10.1016/j.bone.2007.12.009

Table 4.

Multivariate regression analysis comparing whole mechanical properties with percolation parameters

Equation R2 R2-adj
Stiff=27+49 CorrL-184 ChemL+78.9 BboneMass+555 Ct:Tb Nodes+883%hub-158 Tb:Ct Struts 0.633 0.504
FU=16.8+0.04 CorrL-1.33 ChemL+1.20 BboneMass+10.1 Ct:Tb Nodes-25.5%hub-2.02 Tb:Ct Struts 0.210 0.000
ΔT=0.22-0.005 CorrL+0.03 ChemL-0.02 BboneMass-0.04 Ct:Tb Nodes-0.32%hub+0.04 Tb:Ct Struts 0.414 0.254

Multiple linear regression analysis was conducted to determine the amount of inter-strain variation in stiffness, strength (FU), and total displacement (ΔT) using percolation parameters including correlation length (CorrL), chemical length (ChemL), backbone mass (BboneMass), the ratio of cortical to trabecular nodes (Ct:Tb Nodes), the percentage of links to the cortical hub (%hub), and the ratio of trabecular to cortical struts (Tb:Ct) as predictors. The constants or traits shown in bold depict terms in the regression model showing significant (p<0.05) or borderline significant (p<0.1) contributions. R2 values were adjusted for number of independent variables.