Table 3

 Head to head impact test data: percentage difference of headgears relative to the bare head

HeadgearSpeed (m/s)Peak linear accel.% diff.HIPmax% diff.
accel., acceleration; diff., difference; HIPmax, maximum Head Impact Power.
Front boss to side
A2−34.4−21.8
3−32.2−33.9
4−11.7−13.0
5−10.3−5.7
B2−18.1−5.7
3−26.7−30.2
4−18.5−23.7
5−12.9−16.1
C2−67.7−54.7
3−67.4−66.0
4−42.3−42.3
5−45.0−42.2
Forehead to rear
A2−40.2−44.1
3−28.6−34.6
4−19.0−19.6
5−10.3−10.1
B2−33.8−39.2
3−19.1−22.4
4−11.7−12.9
5−6.8−5.9
C2−67.0−66.5
3−65.3−69.2
4−53.8−57.2
5−44.9−45.2
Mean−32.8−32.6
SD20.220.2
CI8.18.1