Reported can mean many things. If I was asked in such a study I would bring up the 7 our situations I know of where I even suspected I might have had a concussion, mostly snowboarding related actually (with helmet), odd given I also played 9 years of football and 9 of Aussie rules. None of them with concussion effects other than maybe I'm done for the day (you tend to take bigger falls when you are tired).
Also seen enough concussions and evaluations to be able to identify those exhibiting obvious symptoms tho I'm not trained in it.
I would let the people running the study decide how to classify them.
Its also not like there is a standard "reporting" form for concussions. Especially further back and esp if you had a team doctor.
I think the parent is implying that all experienced american football linemen have had many concussion situations, so the whole idea of splitting them in to "concussion history" and "no concussion history" can only reflect how the events are reported, and not whether their heads have been smashed repeatedly.
It depends on the definition of concussion used. If you go broad enough everyone likely has had multiple minor ones if they were ever on a playground or ambulatory (walk into wall, accidentally hit in head, fell, etc).
Also seen enough concussions and evaluations to be able to identify those exhibiting obvious symptoms tho I'm not trained in it.
I would let the people running the study decide how to classify them.
Its also not like there is a standard "reporting" form for concussions. Especially further back and esp if you had a team doctor.