Table 3 Stepwise multivariate regression model results

A1-time (m/s)

−0.020 0.025

0.989 < 0.001

A1-length (mm)

0.221 < 0.001

A1-velocity (m/s)

0.133 0.022

0.222 < 0.001

−0.156 0.004

−0.373 < 0.001

A2-time (m/s)

0.111 0.005

0.129 0.001

0.169 < 0.001

−0.789 < 0.001

A2-length (mm)

−0.136 0.017

0.289 < 0.001

−0.248 < 0.001

0.177 0.004

A2-velocity (m/s)

0.408 < 0.001

−0.119 0.008

0.597 < 0.001

HC-time (m/s)

0.289 < 0.001

0.143 0.016

−0.234 < 0.001

HC radius (mm)

0.207 0.001

0.355 < 0.001

DA (mm)

0.155 < 0.001

−0.119 0.039

0.084 0.026

0.151 0.008

−0.785 < 0.001