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.

bri_stats said:

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

This answered a question I did not know how to ask. Taking it to my next appointment.

From the other side of the consultation, briefly. 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.

If somebody has the primary source to hand I would rather cite it than paraphrase it.

VanRx_Mike said:

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

Same experience, arrived at from the opposite direction.

Moderator note: the sourcing question belongs in the vendor section and has been split out. Thread quality here is what the rules are for. Keep it up.