Table 2

Age-stratified cases, external nCFR estimates calculated during the outbreak in China, expected deaths on board the Diamond Princess using these nCFR estimates and the observed number of deaths, February 2020 (n = 619)

Age group

(years)		 Cases External nCFR (95% CI) Expected deaths using external nCFR (95% CI) Observed deaths on cruise ship
0–9 0 0.0% (0.0–0.9) 0 (0–0) 0
10–19 2 0.2% (0.0–1.0) 0 (0–0) 0
20–29 25 0.2% (0.1–0.4) 0.05 (0.02–0.10) 0
30–39 27 0.2% (0.1–0.4) 0.06 (0.04–0.10) 0
40–49 19 0.4% (0.3–0.6) 0.08 (0.06–0.12) 0
50–59 28 1.3% (1.1–1.5) 0.36 (0.31–0.43) 0
60–69 76 3.6% (3.2–4.0) 2.74 (2.5–3.1) 0
70–79 95 8.0% (7.2–8.9) 7.6 (6.8–8.4) 3
80–89 29 14.8% (13.0–16.7) 4.28 (3.8–4.9) 4
–

cCFR: corrected case fatality ratio; CFR: case fatality ratio; CI: confidence interval; cIFR: corrected infection fatality ratio; NA: not applicable; nCFR: naïve case fatality ratio.

Data source: [2] for age-stratified data of cases with symptoms.

External nCFR refers to the CFR calculated during the outbreak in China [7]. Age-stratified case data are taken from [1,2]. The expected number of cases in each age group are calculated assuming that the nCFR estimates were correct on the ship, where the total number of expected deaths under these estimates was 15.15. Data on symptomatic/asymptomatic breakdown and the total number of cases by 20 February were taken from [2] (see Supplementary Table S2 for a more detailed version of this Table).