Maybe too late - but I would add an option for those that have worked in the outdoor industry but no longer do. Be prepared for people that have had numerous jobs in the outdoor industry.
I have been the "vicitm" numerous outdoor accidents, none resulting in serious injury to me. The most troubling, life changing and memorable incidents are where I was a first responder and people died, could have died, or were injured seriously. Does your survey want only victim response, or responder as well?