Fig. 5

The correlation matrix for BMI, age, and the properties of heel following continuous loading. The values displayed in the right-upper triangle represent the Pearson’s correlation coefficients (R values). The lower-left triangle displayes the scatter plots and regression lines. The plots on the diagonal line present the distribution density of the variables in the matrix. P values: .p < 0.100, *p < 0.050, **p < 0.010, ***p < 0.001. BMI: body mass index