Okay, I'll bite. It just doesn't make any sense to me that there is no difference in head injuries and that there are more injuries overall in flag FB.
Any ideas why that's true? I'm assuming everything was done right and it's statistically valid, etc.
No, sorry. My first thought is that is that it's a small sample. Other than that, maybe we need to be careful with all collision sports involving young people, and that presumably would include not only flag football, but could also include soccer, rugby, lacrosse, oh, and, um, pillow fights.
...Addendum: I just read some of the discussions about these results and they define injuries as any time a player missed playing. Some suggest that the flag players are more apt to miss playing and therefore being considered "injured" because of more intense injury concerns of their parents. Also, we're talking about 3% of the 3,800 players as being injured-114 players.
That would affect the overall injury rate, but not the concussion rate. Either there is a concussion or there isn't. You don't hold them out for other reasons, then conclude they had a concussion.