Japan
Prospective cohort study
Primary data collection
3711
Passengers and crew members on board of Diamond Princess cruise ship.
National Institute of Infectious Diseases (NIID). Field Briefing: Diamond Princess COVID-19 Cases. Tokyo: NIID; 19 Feb 2020. Available from: https://www.niid.go.jp/niid/en/2019-ncove/9417-covid-dp-fe-02.html
Total
1 Month
Asymptomatic SARS COV-2
318
Confirmed SARS-COV2 (PCR) without symptoms
Patient characteristics
Age
20-39 years
52
775
50-59 years
31
398
Odds ratio
6.460 (3.130-13.320)
No
Yes
none
ORs are calculated using data reported in the article
Average