Always a bit of fun comparing this particular set of statistics...because neither side really has a leg to stand on.  The prohibition crowd can't prove that marijuana was a factor in the accident/arrest/complication, and neither can the pro-legalization crowd.  Hence, it's a stalemate.  Until there is a field test for marijuana sobriety (i.e, one that detects immediate issues and time-to-consumption similar to alcohol's blood-alcohol level), we won't really know if being high was in the mix.