Donny osmond wrote:This is Tom Chivers, who writes on sciences stuff for UnHerd, and who's motto is "... it might be more complicated than that ..." which is frankly exactly the sort of motto you want any journo to have, but particularly a science writer... his thoughts on the 'More or Less' article mentioned previously.
https://unherd.com/thepost/how-much-dif ... have-made/
How much difference would an earlier shutdown have made?
The Telegraph reports that if Britain had locked down one week earlier, 75% of British Covid-19 deaths would have been prevented. It’s attracted the attention of the BBC’s Jeremy Vine, and George Monbiot in The Guardian.
It’s based on a model by James Annan, a climate scientist, published on his blog, which was mentioned briefly by the BBC’s always fantastic More or Less programme on Tuesday.
I’m not here to debunk the model, exactly, and I would never dare contradict the More or Less team. I just wanted to flag a reason to be concerned with it.
The word ‘model’ can describe many things, from an all-singing, all-dancing climate model which simulates the action of the entire atmosphere and ocean system down to cubic-kilometre units, to a simple statistical curve which says ‘if X goes up by 1, Y will go up by 2’. The Annan model is very much at the latter end.
[
https://l35h2znmhf1scosj14ztuxt1-wpengine]Hindcast/forecast for daily deaths in the UK. Credit: James Annan
Its model is amazingly simple: Covid-19 infections were doubling about every 3.5 days in March; that means you get two doublings in a week. So, if lockdown had happened a week earlier, it would have prevented two doublings, so you’d have got a quarter as many infections and therefore a quarter as many deaths.
.....
None of this is to say that an earlier lockdown would not have saved lives. It almost certainly would. But the stark claim that it would have prevented 75% of deaths — 30,000, so far — is wildly overconfident and I think should be reported with far more uncertainty; the true figure could be much lower.
But why only 1 week?
There were 11 days between our giving up on containment (& most testing and all contact tracing) on 12th March and the U-turn to lockdown on the 23rd.
And at our lockdown we'd had 30 days' warning since the Italians had begun quarantine measures on 22nd Feb (with more general lockdown coming in stages over the next 2 weeks or so).
If we'd assumed British humans are equally susceptible to coronaviruses as Italian humans (as I suspect science would advise), we could have locked down in early March when our cases were in the low hundreds.
But let's be charitable, let's wait till the 12th March. Imagine the government had reacted differently to their failure to contain the virus. Imagine they'd followed the example of the Italians (and others in the Far East) and the advice of the WHO, and locked down then. We'd have had an extra 11 days. But we didn't, and so in those 11 days, the number of cases grew from 590 to 6,650. So the delay enlarged the number of infected by a factor of 11 (this is slightly higher than you'd get with the "doubling in 3.5 days" idea - in fact the doubling was every 3.1 days at that point).
So, "back of an envelope" it may be, but it looks like we could have kept the epidemic to an 11th of its size, had we acted differently on the 12th March, and followed the example of the Italians. The current deaths are approx 45-60k (that's ranging from confirmed death certificate deaths to the likely excess deaths at this point), so we could have saved (very rough ballpark numbers) 40-50k lives at this stage.