Table 5

 High speed ball impact test results

HeadgearBall speed (m/s)Peak linear accel. (g)HIPmax (kW)HIP concussion risk (%)
accel., acceleration; HIPmax, maximum Head Impact Power.
Bare head1016.40.6
1015.10.6
1015.50.5
Mean15.70.5<5
SD0.630.02
95% CI ±0.70.02
2032.91.9<5
3057.55.0
3052.84.5
3055.94.7
Mean55.44.75.3
SD2.40.29
95% CI ±2.70.32
A1015.50.5<5
2029.41.7<5
3059.95.36.1
B1014.50.5<5
2032.91.9<5
3055.14.3<5
C1015.20.5<5
2031.22.0<5
3058.75.97.7