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 4 Multivariate linear regression analysis of risk factors for the length of stay of the total study population (The admission 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
Admission Ct-N values	− 0.328	0.014	− 0.557	− 22.878	< 0.001	− 0.326 ~ − 0.300	0.935	1.070
Age	0.018	0.006	0.074	2.913	0.004	0.006 ~ 0.030	0.856	1.169
Sex (male)	− 0.336	0.172	− 0.046	− 1.958	0.051	− 0.673 ~ 0.001	0.986	1.014
Ethnic (ethnic Han)	− 0.713	0.662	− 0.026	− 1.077	0.282	− 2.012 ~ 0.586	0.983	1.018
Disease category (asymptomatic)	0.952	0.240	0.096	3.960	< 0.001	0.480 ~ 1.424	0.941	1.062
History of allergy	0.229	0.789	0.007	0.289	0.772	− 1.320 ~ 1.777	0.982	1.018
Vaccination (none/incomplete)	0.009	0.106	0.002	0.080	0.936	− 0.200 ~ 0.217	0.978	1.023
Hypertension	− 0.078	0.344	− 0.006	− 0.228	0.820	− 0.752 ~ 0.596	0.822	1.217
Diabetes	− 0.964	0.519	− 0.047	− 1.858	0.063	− 1.982 ~ 0.054	0.856	1.168
(Constant)	17.285	0.619	NA	27.907	< 0.001	16.070 ~ 18.501	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