I think you may be right about Massachusetts. There's a high population of kids in contact sports (soccer, hockey, lacrosse, etc.) and parents that will get any injury, however minor, checked out. Plus the adults in rec leagues for those sports that are willing to go to a doctor just in case.
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It doesn’t have to happen often to make this list, just more often than other states.
I wonder if Massachusetts doesn’t really get more concussions, but might be more likely to get checked for one.