Table 3. Multivariable Cox regression analysis.

Model/Analysis	Multivariable Cox regression
Endpoint	Discharge			Death
Variable	Hazard ratio	95% CI	p-value	Hazard ratio	95% CI	p-value
Sex male1	0.68	0.50–0.94	0.020	1.37	0.74–2.54	0.310
Age 65–74 years2	0.63	0.37–1.06	0.079	3.45	1.49–7.98	0.004
Age ≥ 75 years2	0.71	0.49–1.02	0.067	3.56	1.74–7.30	0.001
Hospital-acquired COVID-193	0.73	0.48–1.12	0.155	0.91	0.45–1.84	0.790
Comorbidities present (≥1)4	0.87	0.60–1.25	0.442	1.30	0.61–2.79	0.494
Length of stay5	1.00	0.99–1.01	0.739	0.98	0.94–1.02	0.372
Model/Analysis	Fine and Gray model
Endpoint				Death
Variable				Subdistribution hazard ratio	95% CI	p-value
Sex male1				1.90	1.04–3.48	0.03
Age 65–74 years2				4.16	1.82–9.49	<0.001
Age ≥ 75 years2				4.13	2.05–8.32	<0.001
Hospital-acquired COVID-193				1.18	0.60–2.34	0.59
Comorbidities present (≥1)4				1.25	0.59–2.68	0.55
Length of stay5				0.98	0.94–1.03	0.23

¹ Reference: female

² reference: age 0–64 years

³ reference: community-acquired COVID-19

⁴ reference: no comorbid condition

⁵ reference: 0 days (Previous length of stay was the time from hospital admission to COVID-19 onset, for patients with community acquired COVID-19, the length of stay was 0 days).