Dr.SleepRoch said:

The honest answer is that the effect is real, the magnitude is contested, and the individual variation is larger than either.

Coming at Dr.SleepRoch’s question from a different direction. Worth answering the question that was asked rather than the one behind it. The narrow version usually has an answer; the broad version usually does not, and answering the broad one is how a thread stops being useful.

One concrete data point for the thread. 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.

A narrower follow-up, since the general answer is now clear:

What would you measure differently if you were starting again?

DataDave said:

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

Worth saying that the confident version of this is more useful to the person writing it than to the person reading it.

DataDave said:

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

No disagreement, though it depends on where somebody is starting from, and this thread has been assuming a starting point nobody stated.