The same man also invented the modern training method for doctors, residency.
Did he develop it as a way to cover up his morphine and cocaine addictions? Possibly. Is working 100-120 hours a week easier on cocaine? Also possibly.
Gamers Nexus has entire videos dedicated to their methodology for different tests. No, there are not p values on their charts; however GN does a great job discussing their experimental design and how it mitigates confounding factors to the extent that GN can control for them.
I would not view it as a difference in accuracy, but you would likely get different numbers because these lab companies may have different methods of testing the same thing.
For example, let's say that you needed to check your sodium level. The same blood sample sent to Quest may come back as 140 with a reference range (normal range) of 135-145 whereas if it was sent to LabCorp it may come back as 137 with a reference range of 130-143.
There would be no clinical difference between those two values because both are within the normal spectrum. The range of normal spectrum though can differ depending on a company's method of testing.
This is one of my favorite games of all time that I am constantly going back and playing again.
So excited to see this.