A new study shows that the youngest football players are less likely to suffer concussions. The results show that 4.3 percent of players from ages 5 to 14 were diagnosed with concussions. Thirty-four percent of the players who did report injuries complained of bruises. Ligament sprains were the second-most common injury, coming in at 16 percent. Researchers found that the behavior of coaches has a direct correlation on the number of injuries, and that the youngest athletes were the least likely to be injured.