Helmet use and bicycle-related trauma injury outcomes.

: It is essential to identify factors that predict helmet use, so as to mitigate the injury and mortality from bicycle accidents.: To examine the relationship between helmet use and the bicycle-related trauma injury outcomes among bicyclists with head/neck injury in the US.: Data from the 2002-2012 National Trauma Data Bank were used, including all trauma bicycle riders involved in bicycle-related accidents whose primary reason for the hospital or Intensive Care Unit stay was head or neck injury.