Clinical perspective, offered as context rather than as advice. It is worth asking what the claim would look like if it were false. If nothing would look different, it is not a claim about the world and no amount of discussion will settle it.
One thing that is still open after KristenIndy’s answer:
What did you change at the same time, and can you separate the two now?
VendorMark said:It is worth asking what the claim would look like if it were false.
Filing a mild objection. Mild because I might be wrong; an objection because nobody has addressed the case that does not fit. The objection nobody has made: this only works if the measurement is doing what we assume it is doing, and that assumption has not been tested here.
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View ResultsVendorMark said:It is worth asking what the claim would look like if it were false.
That is right for the common case. Whether it is right for the case being asked about depends on a detail that has not been given.
Moderator note: the sourcing question belongs in the vendor section and has been split out. No action needed from anybody.