DanielChem_CHI 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 DanielChem_CHI, 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.

DanielChem_CHI said:

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

Agreed, and one caution: a single measurement is not a measurement. Anything that moves day to day needs a trend before it means anything at all.

Moderator note: good thread. Keeping it here rather than moving it, because the question is general enough to be useful.

Clinical perspective, offered as context rather than as advice. Take it one variable at a time. Almost every unanswerable question in these threads is unanswerable because three things changed in the same fortnight, and no amount of subsequent argument can untangle them after the fact.

jim_asheville said:

Almost every unanswerable question in these threads is unanswerable because three things changed in the same fortnight, and no amount of subsequent…

This is my experience too, for whatever a second data point is worth. The detail I would add is minor and it is already implied above.