This vendor ghosted me after I paid, anyone else??

FDA_TrackerJim said:

Practical: whatever you change, write down the date and the reason.

Thank you — that is the clearest version of this I have read, and I have read a lot of them. Taking it to my next appointment.

Adding the clinical framing, because it changes how the question reads. It helps to ask what evidence would change your mind before you look at any. If nothing would, the discussion is not about evidence, and it is better to say so early than to spend nine posts discovering it.

LibrarianMeg said:

It helps to ask what evidence would change your mind before you look at any.

Adding a me-too, because a thread of one person's experience is not much use. Nothing to add that would improve it.

LibrarianMeg said:

It helps to ask what evidence would change your mind before you look at any.

Adding the part of the answer the thread has not reached. 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.

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.