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Sometimes more is less. But in this case, more is more!
I was surprised by your take on the concussion data. You concluded that activity at 7 days prevents chronic post concussion syndrome.
But what if the kids who were the least active on day 7 had the biggest concussion? Then you would expect them to be the most likely to have a post concussive syndrome .
Association is not causality.
I think the conclusion on the qSOFA score needs re thinking I read the article again after this and qSOFA has a lot of misses. As a screening tool on initial presentation SIRS seems to not miss as many.
What you do matters.