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. Author manuscript; available in PMC: 2012 Sep 2.
Published in final edited form as: J Biomech. 2011 Jul 28;44(13):2345–2350. doi: 10.1016/j.jbiomech.2011.07.013

Table 2.

Statistical results of the multiple regression tests for crack density (Cr.Dn) and crack length density (Cr.Ln.Dn). Note that data for the interaction terms was mean-centered. P-values are for the leverage of each predictor, significant predictors are denoted by an asterisk.

Predictor Cr.Dn (R2 = 0.98, p = 0.0003)
Cr.Ln.Dn (R2 = 0.98, p = 0.0003)
Estimate Std error p-value Estimate Std error p-value
Duration-of-use 0.023 0.006 0.013* 0.0029 0.0010 0.038*
BMI 0.018 0.005 0.020* 0.0045 0.0010 0.0051*
Porosity 0.68 0.87 0.47 0.26 0.15 0.15
(Duration of use – 7.87)*(BMI - 26.1) 0.0033 0.0007 0.0050* 0.00019 0.00012 0.18
(Duration of use – 7.87)*(Porosity – 2.97) 0.17 0.15 0.30 0.072 0.0003 0.041*
Intercept −0.18 0.12 0.22 −0.066 0.022 0.03*