Dr.SurgeonPGH said:

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.

Coming at Dr.SurgeonPGH’s question from a different direction. The version of this that has an answer is narrower than the version being asked. Narrow it and it becomes tractable; leave it broad and the thread will produce nine confident and incompatible replies.

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.

Following on from Dr.SurgeonPGH — and this may be the naive question:

What would you measure differently if you were starting again?

VendorMark said:

If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way.

I read this differently from VendorMark, on substance rather than tone. Not convinced. The evidence being cited is consistent with the conclusion and also consistent with two other conclusions nobody has ruled out.

VendorMark said:

If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way.

That is right, and it stops being right at the edges. The general case is well behaved; the interesting cases in this thread are all at the boundary where the general case breaks.

Happy to go further on any of that.