- 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])

University of Michigan - Ann Arbor

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

Bi Q, Wu Y, Mei S et al. Epidemiology and transmission of COVID-19 in 391 cases and 1286 of their close contacts in Shenzhen, China: a retrospective cohort study. The Lancet Infectious Diseases. 2020. doi:10.1016/s1473-3099(20)30287-5

https://www.sciencedirect.com/science/article/pii/S1473309920302875?via%3Dihub

Epidemiology and transmission of COVID-19 in 391 cases and 1286 of their close contacts in Shenzhen, China: a retrospective cohort study

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


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