TABLE 2.

Biomechanical and cumulative HIE metrics.

Abbreviation	Description	Equation
Number of Impacts	Number of impacts	n
X	Combined probability injury risk function	$\left(\frac{1}{1+e^{-\left({\beta }_0+{\beta }_1{a}_i+{\beta }_2{\alpha }_i+{\beta }_3{a}_i{\alpha }_i\right)}}\right)$
RWE	Risk-weighted exposure	${\sum }_{i=1}^n{X}_C$
TWE Exp	Exponential time-weighted exposure	${\sum }_{i=1}^n\left[X_C+{\sum }_{j=1}^m\left[\left(e^{\gamma \left(T_C-T_P\right)}\right)*X_P\right]\right]$
TWE Inv	Inverse time-weighted exposure	${\sum }_{i=1}^n\left[X_C+{\sum }_{j=1}^m\left[\left(\frac{b}{T_C-T_P}\right)*X_P\right]\right]$
TUA	Time until assessment	${\sum }_{i=1}^n\left[\left(\frac{b}{T_D-T_C}\right)*X_C\right]$