Yea, it is interesting. Like everything there's probably a lot of factors at work and there's not a terribly large sample size in football. Kickoff was usually the most dangerous per play. I find it interesting though that punt returns are safer than either kick, run or pass plays. I suppose it's because there's often a fair catch on a punt. This graph came from an article around the time that they were talking about changing the kickoff from the 30 to 35 and thus more touchbacks. One thing that jumps out is that overall the trend is up which is probably more due to bettter/more diligent reporting of injury rather than actual injury incidents increasing?...