Middle-aged people, and not just the elderly, have a dramatically higher risk of dying or developing serious illness from COVID-19, new research from Britain showed on Tuesday.
The findings came in a new comprehensive analysis of virus cases in mainland China.
Researchers from Britain analysed more than 3,600 confirmed COVID-19 cases as well as data from hundreds of passengers repatriated from the outbreak city of Wuhan.
They found that age was a key determining factor in serious infections, with nearly one in five over-80s requiring hospitalisation, compared to around 1 per cent among people under 30.
Taking into account estimates of the number of cases that may not have been clinically confirmed -- that is, mild or asymptomatic infections -- the data showed the hospitalisation rate of patients in their fifties was 8.2 per cent.
The study, published in The Lancet Infectious Diseases journal, estimated that the mortality rate from confirmed COVID-19 cases in mainland China was 1.38 per cent.
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If unconfirmed cases were taken into account, the death rate dropped to 0.66 per cent.
The authors of the research said that while this was significantly lower than previous estimates, COVID-19 is still several times deadlier than previous pandemic viruses, such as H1N1.
"Our estimates can be applied to any country to inform decisions around the best containment policies for COVID-19," said Azra Ghani, a study co-author from Imperial College London.
"There might be outlying cases that get a lot of media attention, but our analysis very clearly shows that at aged 50 and over, hospitalisation is much more likely than in those under 50, and a greater proportion of cases are likely to be fatal."
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