hyun_seoul said:

The useful move here is to separate what is established from what is widely repeated.

This is exactly what I could not find anywhere else. Printing the relevant bit and taking it with me.

Adding the clinical framing, because it changes how the question reads. The honest answer is that the effect is real, the magnitude is contested, and the individual variation is larger than either. Those three things can all be true at once, and most arguments here are two people holding different parts of that.

That is the short version; the long version is somebody else's post.

Dr.PulmRoch said:

Whatever the answer turns out to be, the method for getting there is the same: state the assumption, do the arithmetic in public, and invite the…

I read this differently from Dr.PulmRoch, on substance rather than tone. Filing an objection on the n=1 problem. Personal experience is genuine evidence about one person and very weak evidence about anybody else, and this thread keeps promoting the first into the second.

Adding the numbers, since they settle part of this. If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way. Most of the apparent contradictions in these threads dissolve at that step.

Moderator note: a couple of off-topic posts removed. No action needed from anybody.