17.6% of cases were classified as severe cases, while 82.4% of cases were considered mild.
Of the mild cases, 73.3% were strictly considered mild, 4.2% were classified as non-pneumonia cases, and 5% were asymptomatic cases. Severe:mild case ratio was 1:4


University of Michigan - Ann Arbor

Studies of the Distribution of Severity of COVID-19 Symptoms by Geographic Location in China

Tian, S., Hu, N., Lou, J., Chen, K., Kang, X., & Xiang, Z. et al. (2020). Characteristics of COVID-19 infection in Beijing. Journal Of Infection, 80(4), 401-406. https://doi.org/10.1016/j.jinf.2020.02.018

https://www.journalofinfection.com/article/S0163-4453(20)30101-8/pdf

Characteristics of COVID-19 infection in Beijing

Distribution of COVID-19 severity in Characteristics of COVID-19 Infection in Beijing

- Of 391 cases, 102 (26%) displayed mild symptoms, 254 (65%) presented with moderate symptoms, and 35 (9%) were categorized as displaying severe symptoms.
- Males had significantly higher odds of presenting with severe symptoms (odds ratio (OR) 2.5 [95% CI: 1.1-6.1]), and individuals between ages 60-69 were at an increased risk (OR 3.4 [95% CI: 1.4-9.5])

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