還解釋了新冠病死率在流行初期各國差異很大的原因：大量漏診的有症狀的病人

Case fatality rate (CFR) = total deaths /cases= (total deaths / hospitalizations) * (hospitalizations /cases) = TDHR * HCR =TDHOR*HOCR

TDHOR variation:10%;  HOCR variation: 90%

Conclusion：Major contributing factor for the 27 countries with highest peak CFRs came from undiagnosed, symptomatic case numbers。