Table 2.

Linear regression analysis with "ln blood FPV level (trough value)" as the dependent variable.

	Univariate						Multivariate model 1：Forcibly input a significant variable with a univariate						Multivariate model 2： Input significant variables in univariates by stepwise method
	n	PRC	SE	SPRC	t value	p value	PRC	SE	SPRC	t value	p value	VIF	PRC	SE	SPRC	t value	p value	VIF
Age (per 1 year)	27	−0.012	0.010	−0.231	−1.186	0.247	–						–
Gender (Female vs. Male)	27	0.932	0.471	0.368	1.978	0.059	–						–
Severity of COVID-19	27						–						–
Mild	6	ref
Moderate	19	−0.899	0.572	−0.336	−1.572	0.129
Severe	2	−1.382	0.998	−0.296	−1.386	0.179
Comorbidity	27	0.155	0.489	0.063	0.317	0.754	–						–
WBC (per 1000/μL)	27	−0.214	0.197	−0.212	−1.084	0.289	–						–
ALT (per 1U/L)	27	−0.039	0.011	−0.567	−3.444	0.002	−0.013	0.010	−0.190	−1.285	0.214	1.610	n.e.
CRP (per 1 mg/dl)	27	−0.190	0.029	−0.792	−6.486	0.000	−0.108	0.050	−0.441	−2.176	0.042	3.037	n.e.
Ferritin (per 100 ng/mL)	24	−0.222	0.035	−0.805	−6.361	0.000	−0.091	0.063	−0.328	−1.444	0.164	3.800	−0.222	0.035	−0.805	−6.361	0.000	1.000
D-dimer (per 1 μg/mL)	24	0.079	0.149	0.113	0.533	0.599	–						–
Uric acid (per 1 mg/dL)	25	0.000	0.177	0.000	−0.002	0.998	–						–
eGFR (per 1 ml/min/1.73m2)	27	0.010	0.014	0.136	0.687	0.498	–						–

PRC; Partial Regression Coefficient, SE; Standard error, SPRC; Standardized Partial Regression Coefficient, VIF; Variance Inflation Factor, ref: reference standard, n.e.; not entered.

dependent variable："FPV blood level (trough value)" that has undergone logarithmic conversion.

Multivariate model 1: R² = 0.729, Adjusted R² = 0.688.

Multivariate model 2: R² = 0.648, Adjusted R² = 0.632.