Table 3.

Risk of in-hospital death of patients hospitalized for COVID-19 or influenza

	COVID-19	Influenza	Model 1	Model 2	Model 3
	In-hospital death, n (%)		Adjusted odds ratio (95% CI)	Adjusted odds ratio (95% CI)	Adjusted odds ratio (95% CI)
Full cohort, n (%)	856/16,790 (5·1)	791/27,870 (2·8)	1·95 (1·76-2·16)	1·86 (1·68-2·07)	1·83 (1·64–2·04)
Patients aged 20–69 years old, n (%)	100/8,443 (1·2)	92/2,957 (3·1)	0·58 (0·43–0·79)	0·72 (0·53–0·99)	0·78 (0·56–1·08)
Patients aged 70 or older, n (%)	756/7,255 (10·4)	693/13,355 (5·2)	2·24 (2·01–2·49)	2·10 (1·88–2·35)	2·05 (1·83–2·30)
Mechanical ventilation cohort, n (%)	178/546 (32·6)	229/691 (33·1)	0·81 (0·63–1·05)	0·80 (0·61–1·06)	0·79 (0·59–1·05)

Abbreviations: CI, confidence interval. Influenza was treated as reference. Model 1 adjusted for sex and age. Model 2 additionally adjusted for smoking history, body mass index, and comorbidities (cancer, chronic lung disease, ischemic heart disease, heart failure, arrhythmia, hypertension, diabetes mellitus, cerebrovascular disease, chronic kidney disease, dementia, dyslipidaemia, cirrhosis, deficiency anaemia, and peripheral artery disease). Model 3 additionally adjusted for treatment on admission day (blood transfusion, mechanical ventilation, vasopressor use, renal replacement therapy, and dexamethasone use).