No one is disputing that age is a factor. From the very first line of the foreward:
> As we show in this report, increased bodyweight is the second greatest predictor of hospitalisation and a high risk of death for people suffering from COVID-19. Only old age rates as a higher risk factor.
But if you're really going to compare against age then you'd need to correct for obesity or you're simply including it and possibly compounding any risk.
> the risks of hospitalization in 85+ years is more than 10x the risk in 30-39 year old range.
Is the difference 10x in Japan, too?
The point is (or was) to discern a difference between why Japan has lower cases and/or mortality vs Europe and America. All three have plenty of old people, Japan has the greatest percentage. There is also a marked difference between their average waistlines too.
Japan should have the highest cases and/or mortality of the three and yet it has the lowest. I'm not a betting man and "masks are the reason", without a shred of evidence to back it, isn't going to change that habit, especially given the competition:
> Is this link between COVID-19 and overweight found across the globe?
> Yes.
> A large number of studies and systematic reviews have found increased risk of severe symptoms from COVID-19 associated with excess bodyweight. The table here gives some examples (pg 14)
And the table really does give plenty of examples. From the US:
> People with obesity more than twice as likely to need hospitalisation and more than six times as likely to need mechanically assisted breathing and more than six times as likely to die following development of COVID-19. (pg 14)
From the UK:
> People with overweight 67% more likely to need intensive care, and people with obesity three times as likely to need intensive care, following development of COVID-19. (pg 14)
…among many others. It continues:
> Taking data from over 160 countries, we find linear correlations between a country’s COVID-19 mortality rates and their estimated degree of overweight or obesity prevalence (pg 15)
and here's the kicker:
> The diagram shows high mortality rates *only* in countries where overweight prevalence exceeds around 50% of the adult population. (pg 15)
Emphasis mine. As to directly comparing Japan and the US and UK, they've added a helpful index:
- COVID-19 deaths per 100,000 population (01/01/2021)
- Adult overweight BMI >25kg/m2 (2016)
- Adult obesity BMI >30kg/m2 (2016)
- Population age over 65 years (%) (2020)
- Per capita Gross Domestic Product $US (2019)
- Healthy life expectancy years (2019)
Insufficient physical activity % adults (2016)
- Japan 2.60, 27.2, 4.3, 28.4, 74.1, 35.5
- UK 110.73, 63.7, 27.8, 18.7, 70.1, 35.9
- US 105.68, 67.9, 36.2, 16.6, 66.1, 40.0
As to mask wearing, well, if survey results of real world usage are to be believed, then it really is no contest, as the charts here show:
https://twitter.com/ianmSC/status/1366148529983426560
Edit: formatting. I do like the stripped down approach of HN but would it really be too much to supply a markdown processor, or a format guide?