PeptideChemSF said:

Month 6 update on sleep apnoea: down 48 lbs from my starting weight of 253 lbs.

I read this differently from PeptideChemSF, 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.

The figures, for anyone assembling their own picture. Say what you would expect to see if you were wrong, before you look. It is a small discipline and it changes what you notice.

mike.trainer_LA said:

Personal experience is genuine evidence about one person and very weak evidence about anybody else, and this thread keeps promoting the first into the…

Adding the part of the answer the thread has not reached. Order of operations matters more than any single choice here: establish a baseline, change one thing, wait long enough for it to express itself, then measure again under the same conditions.

Following on from PedsEndoPhilly — and this may be the naive question:

What would you measure differently if you were starting again?

Closing the loop on my own question.

Update, and it is the boring outcome: nothing was wrong. The measurement I was reading had moved less than its own week-to-week variation, which somebody said upthread and I did not believe.