The Lancet has published the results of an in-depth study which looks at the Chinese outbreak. Well worth having a read here:
https://www.thelancet.com/journals/laninf/article/PIIS1473-3099(20)30243-7/fulltext
For those who don't have time some of the key findings are...
Estimates of case fatality ratio
Overall 1023 44 672 (Crude) 2·29% (2·15–2·43) (Adjusted for censoring) 3·67% (3·56–3·80) (Adjusted for censoring, demography, and under-ascertainment)1·38% (1·23–1·53) (Infection fatality ratio) 0·657% (0·389–1·33)
Severe cases All cases Proportion of infected individuals hospitalised
0–9 years 0 13 0·00% (0·00–0·00)
10–19 years 1 50 0·0408% (0·0243–0·0832)
20–29 years 49 437 1·04% (0·622–2·13)
30–39 years 124 733 3·43% (2·04–7·00)
40–49 years 154 743 4·25% (2·53–8·68)
50–59 years 222 790 8·16% (4·86–16·7)
60–69 years 201 560 11·8% (7·01–24·0)
70–79 years 133 263 16·6% (9·87–33·8)
≥80 years 51 76 18·4% (11·0–37·6)
Originally Posted by: Brian Gaze