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. 2014 May 20;4(5):e005078. doi: 10.1136/bmjopen-2014-005078

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Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions

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Mean peak angular velocity of the head, for all unique directional components (X, Y, −Y, Z) and resultant (R). Significance levels: *p<0.01, **p<0.001 (two-sample t test for unequal variance). Error bars represent one SD.