The paper by the CCDC, released on Monday and published in the Chinese Journal of Epidemiology, looked at all 72,314 cases of Covid-19 diagnosed across China as of 11 February, including confirmed, suspected, and asymptomatic cases, SIA reports referring to foreign media.
While the results largely confirm previous descriptions of the virus and patterns of infection, the study includes a detailed breakdown of the 44,672 confirmed cases across all of China.
Some of the conclusions reached include the following:
- Some 80.9% of infections are classified as mild, 13.8% as severe and only 4.7% as critical.
- The highest fatality rate is for people aged 80 and older, at 14.8%.
- For children up to 9, there have been no fatalities and up to the age of 39, the death rate remains low at 0.2%.
- For the next age groups, the fatality rates increase gradually: For people in their 40s it is 0.4%, in their 50s it is 1.3%, in their 60s it is 3.6% and their 70s it is 8%.
- Looking at the sex ratio, men are more likely to die (2.8%) than women (1.7%).
- Identifying which existing illnesses put patients at risk, the study finds cardiovascular disease at number one, followed by diabetes, chronic respiratory disease and hypertension
Pointing out the risk for medical staff, the paper says that a total of 3,019 health workers have been infected, 1,716 of which were confirmed cases and five had died by 11 February, which was the last day of data included in the research.
On 13 February, China broadened its definition of how to diagnose people, including "clinically diagnosed cases" which previously were counted separate from "confirmed cases".
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