I believe FNR depends on swabbing (which varies based on equipment and individual doing it), on PCR equipment, and on the patients (e.g. how early are you testing people? age of patients, etc). Then there’s issue of how you get ground-truth which might also contribute to variation in these estimates.
Also, when I look around, I find charts like these that suggest the claimed false negative rates vary absurdly!
I believe FNR depends on swabbing (which varies based on equipment and individual doing it), on PCR equipment, and on the patients (e.g. how early are you testing people? age of patients, etc). Then there’s issue of how you get ground-truth which might also contribute to variation in these estimates.
Where did this chart come from?
Oops! Source: https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0242958