Fig. 2.

Bland-Altman plots to demonstrate agreement between systems for IPA measures at 14 and 18kmph on both testing days. Key: IPA = initial peak acceleration; diff = difference; g = gravitational force; kmph = kilometres per hour. Note: Thick black lines correspond to 95% limits of agreement, dashed black line corresponds to observed mean agreement. Where the y axis is 0, this indicates line of perfect agreement.