Adding the clinical framing, because it changes how the question reads. 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.

dan_philly said:

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

Thank you for spelling out the reasoning rather than just the conclusion. Taking it to my next appointment.

Clinical perspective, offered as context rather than as advice. 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.

pat_auckland said:

Worth answering the question that was asked rather than the one behind it.

Same experience, arrived at from the opposite direction.

Moderator note: two posts asking for a source have been merged into one. Please search the thread before asking again. Report rather than reply if it drifts again.