Need to Clarify Mechanisms Explaining the Effect of Screen Time on Recovery From Concussion—Reply
In Reply We thank Knell and colleagues for bringing attention to the possibility of decreased energy expenditure as a confounding mechanism explaining the effect of screen time on prolonging recovery from concussion.1 It was a limitation of our study that we did not measure energy expenditure, and it is not known what activities substituted for the 500 fewer minutes of screen time in the screen time abstinent group.
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