Table 3. Risk factors for all-cause and COVID-19-related hospital transfer in the propensity-score-matched cohort.

Outcomes	Variables	Univariate analysis, OR (95% CI)	P value	Multivariate analysis, adjusted OR (95% CI)	P value
All-cause hospital transfer	Delta-dominant group	1.74 (1.09–2.80)	0.020	1.91 (1.16–3.13)	0.011
	Age < 55 yr	0.49 (0.29–0.83)	0.007	0.43 (0.24–0.76)	0.004
	Age 55–64 yr	2.00 (1.18–3.39)	0.010	-	-
	Age ≥ 65 yr	2.21 (0.26–19.15)	0.408	-	-
	Male	0.95 (0.60–1.51)	0.825	-	-
	Diabetes	1.84 (0.22–15.47)	0.458	-	-
	Hypertension	3.03 (0.98–9.35)	0.066	-	-
	Hyperlipidemia	3.19 (0.65–15.62)	0.169	-	-
	Hypothyroidism	5.54 (0.50–61.82)	0.230	-	-
	Fever on the admission day	8.59 (3.84–19.23)	< 0.001	7.02 (2.96–16.63)	< 0.001
	Pneumonia on the admission day	4.54 (2.30–8.97)	< 0.001	3.34 (1.60–6.97)	0.001
	Asymptomatic on the admission day	0.46 (0.26–0.81)	0.006	0.49 (0.27–0.88)	0.017
COVID-19-related hospital transfer	Delta-dominant group	1.61 (0.94–2.76)	0.081	1.86 (1.04–3.32)	0.036
	Age < 55 yr	0.39 (0.22–0.70)	0.001	-	-
	Age 55–64 yr	2.69 (1.51–4.78)	0.001	3.12 (1.64–5.95)	0.001
	Age ≥ 65 yr	NA	> 0.999	-	-
	Male	1.03 (0.60–1.76)	0.916	-	-
	Diabetes	2.57 (0.30–21.67)	0.360	-	-
	Hypertension	2.96 (0.84–10.45)	0.106	-	-
	Hyperlipidemia	4.47 (0.91–22.02)	0.102	-	-
	Hypothyroidism	7.73 (0.69–86.54)	0.174	-	-
	Fever on the admission day	8.81 (3.77–20.60)	< 0.001	6.47 (2.54–16.47)	< 0.001
	Pneumonia on the admission day	6.78 (3.36–13.64)	< 0.001	4.79 (2.22–10.31)	< 0.001
	Asymptomatic on the admission day	0.25 (0.11–0.55)	< 0.001	0.25 (0.11–0.57)	0.001

Data are presented as odds ratio (95% confidence interval).

COVID-19 = coronavirus disease 2019, NA = not available.