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. Author manuscript; available in PMC: 2010 Jul 1.
Published in final edited form as: J Mech Behav Biomed Mater. 2008 Sep 6;2(3):255–263. doi: 10.1016/j.jmbbm.2008.08.005

Table 2.

Linear least squares linear regression of the elastic constants, C33, C22 and C11 (GPa), and anisotropy ratios, C33/C11 and C33/C22, in the three mutually orthogonal specimen axes with the apparent tissue density (ρg/cm3). Note that correlations for shear stiffness coefficients, C44, C55 and C66, were not statistically significant.

Parameter Intercept Slope p R2
C11 -56.5 38.5 <0.0001 0.78
C22 -18.1 19.9 <0.0001 0.53
C33 -15.5 22.5 <0.0001 0.67
C33/C11 7.30 -2.95 <0.0001 0.61
C33/C22 2.04 -0.34 0.06 0.06
C11/C22 -1.31 1.13 <0.0001 0.42