Got it, but it sure is a weird stat. 97 percent of AIS 2 or higher injuries to the lower body were AIS 2 or AIS 3. What the heck does that mean? 100 percent of AIS 2 injuries to the lower body were AIS 2. Here's the list of what AIS means:
http://www.trauma.org/archive/scores/ais.html
AIS Score Injury
1 Minor
2 Moderate
3 Serious
4 Severe
5 Critical
6 Unsurvivable
So all that stat really means is that 97% of those that are moderate or higher turn out to be moderate or serious, meaning only 3% of lower extremity injuries are severe, critical, or unsurvivable. Read a certain way, it could be used to show that the chances of a life-threatening lower body injury is extremely unlikely in a motorcycle accident (upper-body injuries are much more likely).