Table 4.

Estimates of geometric mean ratios and 95% CI of IgG from the univariate linear mixed models and multivariate linear mixed model.

Characteristics*	Crude GMR (95% CI)	P-value	Adjusted GMR (95% CI)	P-value
Time (month)	0.73(0.72,0.74)	<.0001	0.73(0.72,0.74)	<.0001
Age (per 5 years)	1.01(0.81,1.25)	0.95	0.83(0.60,1.15)	0.25
Female vs Male	1.15(0.34,3.89)	0.82	4.78(0.99,22.98)	0.05
Caucasian vs Other races†	0.33(0.09,1.12)	0.07	0.19(0.03,1.02)	0.05
Black African vs Other races†	0.41(0.08,2.19)	0.29	0.12(0.01,1.22)	0.07
Fever vs No fever	0.88(0.28,2.81)	0.83	0.57(0.12,2.61)	0.46
Loss of smell and taste vs
Neither loss of smell nor taste††	3.38(0.95,12.00)	0.06	9.40(1.12,78.97)	0.04

^⁎Missing data of categorical variables of baseline characteristics were imputed by the category which occupies the majority, and continuous variables had no missing data: race: 1 missing data was replaced by Caucasian; fever: 1 missing data was replaced by no; loss of smell and taste: 1 missing data was replaced by loss of smell and taste.

^†Including Hispanic, Indian, Pakistani and other Asian than Chinese and Japanese.

^††No participant in the study only lost smell or only lost taste.

Abbreviation: GM = geometric mean ratio.