Variable Number
Sex Sex
Male Male 16152 (58%)
Female Female 11701 (42%)
Other Other 9 (0%)
Days from symptom onset to hospitalization Days from symptom onset to hospitalization 5 [2, 7]
Age 57 [41, 73]
0-64 16927 (60.7%)
65- 10938 (39.3%)
Ethnicity
Japanese Japanese 26407 (95.8%)
Other ethnicity Other ethnicity 1156 (4.2%)
Smoking history
Former or current smoker Never Unknown Former or current smoker Never Unknown
10246 (36.9%)
12771 (46.0%)
4771 (17.2%)
Drinking alcohol
Daily (3 cans per day) Occasional None Unknown Daily (3 cans per day) Occasional None Unknown
2087 (7.6%)
9301 (34.1%)
9179 (33.6%)
6738 (24.7%)
BMI BMI 23.5 [20.9, 26.5]
Contact history within 14 days before onset Contact history within 14 days before onset
Travel to COVID-19 countries Travel to COVID-19 countries 432 (1.6%)
Contact with COVID-19 patients Contact with COVID-19 patients 13934 (50.3%)
NEWS score
0–4 5–6 7- Unknown 0–4 5–6 7- Unknown
21568 (77.4%)
2320 (8.3%)
1759 (6.3%)
2218 (8%)
No oxygen administration during admission No oxygen administration during admission 17530 (62.9%)
Oxygen administration during admission Oxygen administration during admission 8844 (31.7%)
Ventilator use during admission Ventilator use during admission 1483(5.3%)
Comorbidities Comorbidities
No comorbidity No comorbidity 13659 (49.1%)
Any comorbidity Any comorbidity 14206 (50.9%)
Cerebrovascular Disease Cerebrovascular Disease 1738 (6.2%)
Bronchial Asthma Bronchial Asthma 1479 (5.3%)
COPD/Chronic Lung Disease COPD/Chronic Lung Disease 1050 (3.8%)
Liver Dysfunction Liver Dysfunction 688 (2.5%)
Hypertension Hypertension 8239 (29.6%)
Hyperlipidemia Hyperlipidemia 4001 (14.4%)
Diabetes Mellitus Diabetes Mellitus 4693 (16.8%)
Obesity diagnosed by physicians Obesity diagnosed by physicians 1686 (6.1%)
Moderate to Severe Renal Dysfunction/Hemodialysis Moderate to Severe Renal Dysfunction/Hemodialysis 471 (1.7%)
Solid Tumor/Metastatic Solid Tumor Solid Tumor/Metastatic Solid Tumor 1062 (3.8%)
Leukemia/Lymphoma Leukemia/Lymphoma 171 (0.6%)
Collagen Disease Collagen Disease 356 (1.3%)
HIV/AIDS HIV/AIDS 55 (0.2%)
Outcome Outcome
Discharge Discharge 20872 (74.9%)
Transfer to a different hospital Transfer to a different hospital 3326 (11.9%)
Transfer to non-medical facility Transfer to non-medical facility 1331 (4.8%)
Transfer to long-term care facility Transfer to long-term care facility 1043 (3.7%)
Death Death 1285 (4.6%)