Epidemiological Characteristics of Coronavirus (Covid-19) in China 2020

key results:

Results: A total of 72,314 patient records—44,672 (61.8%) confirmed cases, 16,186 (22.4%) suspected cases, 10,567 (14.6%) clinically diagnosed cases (Hubei Province only), and 889 asymptomatic cases (1.2%)—contributed data for the analysis. Among confirmed cases, most were aged 30–79 years (86.6%), diagnosed in Hubei (74.7%), and considered mild (80.9%). A total of 1,023 deaths occurred among confirmed cases for an overall case fatality rate of 2.3%. The COVID-19 spread outward from Hubei Province sometime after December 2019, and by February 11, 2020, 1,386 counties across all 31 provinces were affected. The epidemic curve of onset of symptoms peaked around January 23–26, then began to decline leading up to February 11. A total of 1,716 health workers have become infected and 5 have died (0.3%).

   Table 1 shows significant skew in fatality rates by age
           Cases       deaths      CFR
     total 44,672     1,023 2.3  
     Age, years     
      0–9    416 (0.9)    − −  
     0–19    549 (1.2)    1 (0.1) 0.2  
    20–29  3,619 (8.1)    7 (0.7) 0.2  
    30–39  7,600 (17.0)  18 (1.8) 0.2  
    40–49  8,571 (19.2)  38 (3.7) 0.4  
    50–59 10,008 (22.4) 130 (12.7) 1.3  
    60–69  8,583 (19.2) 309 (30.2) 3.6  
    70–79  3,918 (8.8)  312 (30.5) 8.0  
    ≥80    1,408 (3.2)  208 (20.3) 14.8

where average fatality ratio was 2.3% but 3.6% of those 60-69, 8% of those 70-79 and 14.8 of those over 80 died.