According to the American Academy of Neurology,resolution of concussion symptoms or mental status abnormalities that occur for longer than 15 minutes result in what grade concussion?

Question

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Resolution of concussion symptoms or mental status abnormalities that occur in less than 15 minutes is a grade I concussion, while abnormalities lasting longer than 15 minutes would be grade II. Grade III concussion is characterized by any loss of consciousness.

According to the American Academy of Neurology,resolution of Concussion Symptoms