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@Chalfie
OK. So the thing I meant about false positives/false negatives is that it's more risky to have false negatives as they obviously will be wandering around shedding virus everywhere. That was my point on that.
I don't think @snottyotter you've missed anything.
We're going to look at positivity rates in the local area in school lfd tests. It's comparing two different testing methods and different test populations. And knowing what's going on is important.
(bland obvious statement right?)
Is it one test in a year = year closed? And then multiple +ve tests = school closed?
The low numbers in London kids probably indicate the low numbers in London overall, I'm guessing.
https://www.bmj.com/content/371/bmj.m4848
https://www.bmj.com/content/372/bmj.n287
"But a “green light” negative result should not be taken as a sign that all is well, he says, and particularly not to do anything you would not have done otherwise"
Jon Deeks, who leads the Biostatistics, Evidence Synthesis and Test Evaluation Research Group at the University of Birmingham’s Institute of Applied Health Research
There's a whole load of stuff to get into here:
https://www.bmj.com/search/advanced/lateral%20flow