Table 3.

Relationship between vaccination and disease severity of the Omicron infection.

Parameter estimated value
		Coefficients	OR (95%CI)	p-value
Threshold	Asymptomatic	0.154	1.166 (0.967-1.408)	0.108
	Mild	3.078	21.715 (16.593-28.417)	<0.001
Location	Vaccination doses	-0.219	0.803 (0.742-0.868)	<0.001

Multivariate ordered logistic regression model was used to analyze the effects of vaccine doses and intervals on disease severity of the patients. Three clinical symptom categories, “asymptomatic”, “mild” and “moderate”, were treated as dependent variables of vaccine doses and intervals and designated to indicate the aggravating disease severity, with 3 severe and critical patients excluded from analyses. The Results showed that the increased number of vaccines significantly reduced the risk of severe diseases (OR = 0.803, 95%CI: 0.742-0.868, p < 0.001).