JenPlateau said:

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

This matches mine closely enough to be worth saying so out loud. The detail I would add is minor and it is already implied above.

JenPlateau said:

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

Adding the part of the answer the thread has not reached. Whatever the answer turns out to be, the method for getting there is the same: state the assumption, do the arithmetic in public, and invite the correction. That is slower than asserting, and it is the only version that survives being wrong.

That is the short version; the long version is somebody else's post.

One concrete data point for the thread. One habit that pays for itself: post the method alongside the number. A figure without its method cannot be checked, and an unchecked figure is how this community accumulates folklore.

One thing that is still open after JenPlateau’s answer:

Did your prescriber agree with that reading, and if not what was their objection?

Dr.PathRoch said:

One habit that pays for itself: post the method alongside the number.

I am going to disagree with the direction of travel here. The thread has converged on the tidiest answer rather than the best-supported one, and those are not the same thing.