Stop and think about the age of those involved in the sport and the risk taking associated with that age. If there are demographics, it would probably show that the majority of injuries are with teens with little or no experience, and the three most common injuries are broken wrists, collar bones, and head injuries. Most are due to the inexperience factor and lack of concern for protecting their gray matter (no helments). Anybody who skis frequently would observe this. Maybe Tucker can shed additional light on the reasons. I'm a skier, not a boarder. Tried the dark side and didn't care for it.
On the other hand...fishing???? How does one get injured throwing in a line and poping a cold one???
Maybe having too many cold ones could be a factor. Lou, it doesn't say what is considred hiking. Maybe climbing is grouped into that. Some of the hikes I do includes a degree of scaling rocks and if slippery does present a hazard. I dunno?