Skiing: People who ski report high numbers of concussions, according to the study, though part of that is due to the large number of skiers. Skiers also face an especially high risk for ACL tears and other knee injuries.
Snowboarding: Snowboarders face the highest concussion risk of the athletes in the study, with a risk per-hour spent riding that's triple that of skiers.
Snowmobiling: Snowmobilers didn't have particularly high injury rates in this study, though risks of skull fractures were higher than for other winter sports. Other studies have shown risks for serious injury and death, often related to snowmobiling after drinking.
Motocross: There wasn't enough data to calculate injury rates per-hour spent in the sport, but motocross riders had the highest incidence of broken necks; 27.6% of all reported neck fractures in the study came from motocross.
next slide will load in 15 secondsSkip AdSkip AdSkateboarding: By far, skateboarders were the most likely to suffer a skull fracture. They also had the highest overall risk for head and neck injuries.
Surfing: Surfers had one of the lowest concussion rates in the study, but had especially high rates of neck fractures — 38 times higher than skateboarders.
Mountain biking: Using the per-hour spent doing the sport calculation, mountain bikers' risk for neck fractures was second only to that of surfers.
Wingsuit flying: Wingsuit flight is in a category of its own, not nearly common enough to be studied alongside other adventure sports. But it's perhaps the extreme activity with the highest risk of death. One study found that 72% of BASE jumpers had witnessed a death or serious injury, and wingsuit flying is one of the deadliest forms of BASE jumping.