One concrete data point for the thread. One practical note: write down what you did and when, before you need it. Reconstructing a timeline from memory three months later is how people end up unable to answer the one question that would have resolved it.
A narrower follow-up, since the general answer is now clear:
What did you change at the same time, and can you separate the two now?
DataDave said:One practical note: write down what you did and when, before you need it.
Adding the part of the answer the thread has not reached. 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.
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Shop Reference StandardsOP back with an update, since a thread like this is useless without one.
Closing this out. What actually changed my mind was the point about waiting for a trend instead of reading a single measurement, which is embarrassing in hindsight and worth saying anyway.
anna.melb_AU said:Worth answering the question that was asked rather than the one behind it.
Agreed, and the size of the effect matters as much as its existence. Something real and small gets treated here as though it were real and decisive.