Table 3.

Factors that predict severity of illness due to infection by an XBB variant of SARS-CoV-2.

Variable	Odds ratio (95% CI)	p value
Age (5)	0.47 (0.26–0.86)	0.015
Vaccination	64.36 (0–140.17)	0.817
AZD1222	3.04 (0.2–45.12)	0.420
No. of vaccine doses	2.79 (0.26–29.94)	0.396
Vaccination prior to COVID-19	0.006 (0–1.35)	0.774

By using binary regression model (please refer to Fig. 2B), variables that showed a significant relationship with the terminal illness in age adjusted model were subsequently included in the multivariate model.

Factors with p <0.05 multivariate model were considered as independent predictors of terminal illness. Age (5)—represent with increase of every 5 years.