Clinical characteristics and risk factors for a prolonged length of stay of patients with asymptomatic and mild COVID-19 during the wave of Omicron from Shanghai, China

Table 3 Multivariate linear regression analysis of risk factors for the length of stay of the total study population (The lowest Ct-N values)

Risk factors	B	SE	β	t values	P values	95% CI	Collinearity statistics
Risk factors	B	SE	β	t values	P values	95% CI	Tolerance	VIF
Lowest Ct-N values	− 0.374	0.011	− 0.714	− 34.806	< 0.001	− 0.395 ~ − 0.353	0.933	1.072
Age	0.013	0.005	0.055	2.556	0.011	0.003 ~ 0.023	0.859	1.165
Sex (male)	− 0.257	0.145	− 0.035	− 1.774	0.076	− 0.541 ~ 0.027	0.985	1.015
Ethnic (ethnic Han)	− 0.153	0.558	− 0.005	− 0.274	0.784	− 1.248 ~ 0.942	0.981	1.019
Disease category (asymptomatic)	0.556	0.203	0.056	2.736	0.006	0.157 ~ 0.954	0.935	1.069
History of allergy	− 0.130	0.665	− 0.004	− 0.196	0.845	− 1.434 ~ 1.174	0.983	1.017
Vaccination (none/incomplete)	0.044	0.089	0.010	0.491	0.624	− 0.131 ~ 0.219	0.979	1.021
Hypertension	− 0.095	0.289	− 0.007	− 0.328	0.743	− 0.663 ~ 0.473	0.822	1.217
Diabetes	− 0.598	0.437	− 0.029	− 1.368	0.171	− 1.456 ~ 0.260	0.855	1.170
(Constant)	18.434	0.465	NA	39.680	< 0.001	17.302 ~ 20.157	NA	NA

The comparator is listed in parentheses after each categorical variable
B unstandardized coefficient, SE standard error, β standardized coefficient, CI confidence interval, VIF variance inflation factor, NA not available

ISSN: 1471-2334