Feb 20, 2020 11:35:00

New coronavirus has a fatality rate of 2.3% and mild symptoms of over 80%, but the fatality rate varies greatly with age.

On February 17, 2020, the

China Center for Infectious Disease Control and Prevention (CCDC) released the results of the first large-scale survey on a new type of coronavirus infection, COVID-19 . The study, which looked at more than 70,000 cases, found that more than 80% of people with COVID-19 were mild and had an overall mortality of 2.3%, but at the same time It was also shown that there was a large difference in the fatality rate.

The Epidemiological Characteristics of an Outbreak of 2019 Novel Coronavirus Diseases (COVID-19) — China, 2020
http://weekly.chinacdc.cn/en/article/id/e53946e2-c6c4-41e9-9a9b-fea8db1a8f51

Vast Majority of Coronavirus Infections Are Mild, Huge Study Has Revealed
https://www.sciencealert.com/large-chinese-study-finds-most-coronavirus-infections-are-mild

By February 11, 2020, the CCDC New Coronavirus Pneumonia Emergency Response Epidemiology team has been confirmed to be infected, suspected, clinically diagnosed as infected, and infected. The study was conducted on 72,314 people who reported that the patient was asymptomatic, and the disease was analyzed in detail for 44,672 subjects (61.8% of the total) who were confirmed to be infected.

The research team for the symptoms of an infected person, non-pneumonia and mild if pneumonia 'mild', 30 or more times, blood oxygen saturation in difficulty breathing and respiratory frequency of severe one minute is less than 93% · PaO ₂ / FiO ₂ is defined as “severe” if lung infiltration rate is 50% or more within 24 to 48 hours, less than 300, and “fatal” if respiratory failure, septic shock, multiple organ failure / multiple organ failure. Based on this definition, 36,160 (approximately 80.9%) infected cases were classified as mild, 6168 (13.8%) severe cases, and 2087 (4.7%) fatal cases. have become. In addition, 1023 people, which is about half of infected people classified as fatal, have died.

The number of cases and mortality by age based on the survey results are also announced in detail. Here is the list. Confirmed Cases (number of confirmed cases), Deaths (number of deaths), Case Fatality Rate (lethal rate) for each age are listed, and the figures in parentheses are all figures `` what percentage of the whole '' is. Looking at the fatality rate, fatalities are not indicated because there are no fatalities under 10 years old. The fatality rate in the teens, 20s and 30s is 0.2%, and the fatality rate in the 40s is 0.4%, 50 1.3% in their teens, 3.6% in their 60s, 8% in the 70s, 14.8% in those over 80. All together, the overall mortality rate is 2.3%. The results indicate that COVID-19 mortality gradually increases as the age increases.

Looking at the Sex section, male mortality is 2.8%, female mortality is 1.7%, and male mortality is higher.

Looking at the section of Comorbid condition (hypertension), the fatality rate of hypertension patients is 6%, Diabetes (diabetes) patients are 7.3%, Cardiovascular disease patients are 10.5%, Chronic respiratory disease (chronic) The results were 6.3% for patients with respiratory disease, 5.6% for Cancer patients, 0.9% for None (unaffected), and 2.6% for Missing (unknown). It turns out that it is dangerous to have COVID-19 concurrently if you already have a medical condition.

The research team also reported that 'the first peak of the epidemic' was from January 24 to 26, 2020, and that the overall epidemic has slowed since February 11. This trend suggests that the media's call for complete blockade of the city, washing of hands and wearing masks may have been effective.