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Ive have 0 qualification in public health but my wife works at LSHTM and has been explaining the epi basics to me and I've been listening to their staff conferences.
As far as i can gather the inputs, at the moment, are changing rapidly. Once they have some more info on the serological profile of the virus it will get much more accurate.
It's very difficult to give a single figure because of the wide disparities in fatality rates between different age groups - 0% for 0-9 years, nearly 20% for 80+ in Italy. The average IFR for a population will therefore depend on the demographics of the population - an older population will have a higher IFR. And of course given the susceptibility of people with pre-existing conditions, how healthy the population is overall.
AFAIK the Imperial model is the best that's public domain. I imagine the error factor is huge though.