Clinical perspective, offered as context rather than as advice. The distinction that resolves most of these threads is between what is true on average and what is true for one person. Both are real; they answer different questions and get quoted as if they were the same one.
OP back with an update, since a thread like this is useless without one.
Update — I was wrong in the opening post, specifically about the direction. Correcting it here rather than editing it away.
jim_asheville said:The distinction that resolves most of these threads is between what is true on average and what is true for one person.
Coming at jim_asheville’s question from a different direction. There is a difference between no evidence and evidence of no effect, and this subject is one where the two get swapped freely in both directions.
Ask again with the specifics and you will get a better answer than this one.
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View ResultsThe figures, for anyone assembling their own picture. One habit that pays for itself: post the method alongside the number. A figure without its method cannot be checked, and an unchecked figure is how this community accumulates folklore.
A narrower follow-up, since the general answer is now clear:
What would you measure differently if you were starting again?