Helmet use among motorcycle and moped riders injured in Hawaii: Final medical dispositions from a linked database.
Galanis, DJ, Ly, CL, Wong, LL, Steinemann, S, Rosen, L. Journal of Trauma and Acute Care Surger: Nov 2014, 77(5), pp 743-748.
Abstract
The magnitude of the protective associations between helmets and medical outcomes was generally greater than that reported by other studies. Motorcyclists seem to benefit from helmet use more that moped riders.