Dr.RheumBOS said:

Most of what circulates confidently in this community traces back to one summary of one study, and the qualifier was dropped somewhere in the third…

This is my experience too, for whatever a second data point is worth. The detail I would add is minor and it is already implied above.

Dr.RaviCardio said:

If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way.

Adding a me-too, because a thread of one person's experience is not much use. I had assumed I was the exception until I read this.

Dr.RaviCardio said:

If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way.

Adding the part of the answer the thread has not reached. Take it one variable at a time. Almost every unanswerable question in these threads is unanswerable because three things changed in the same fortnight, and no amount of subsequent argument can untangle them after the fact.

The figures, for anyone assembling their own picture. 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.

Moderator note: a post naming a supplier has been edited. Discuss suppliers in the review sections, not here. Tagging this one for the weekly digest.