Table 2.

Summary of Regression Models for Hospitalization, ICU Admission and Mortality

	Statistic	Reference Level	Coefficient	Estimate (95% CI)	P Value
Model 1: Mortality*	Hazard ratio (HR)	Unvaccinated	Partially vaccinated	0.87 (0.68, 1.12)	0.28
			Fully vaccinated	0.36 (0.30, 0.43)	<0.001
			Boosted	0.33 (0.23, 0.48)	<0.001
Model 2: Hospitalization Count†	Incidence rate ratio (IRR)	Unvaccinated or partially vaccinated	Fully vaccinated or vaccine-boosted	0.68 (0.65, 0.71)	<0.001
Model 3: ICU Admission Count‡	Incidence rate ratio (IRR)	Unvaccinated or partially vaccinated	Fully vaccinated or vaccine-boosted	0.63 (0.58, 0.68)	<0.001

^⁎Inverse probability treatment-weighted model with time-dependent covariate for vaccination.

^†Negative binomial regression model for count of hospitalizations.

^‡Negative binomial regression model for count of ICU admissions.

Adjustment covariates: age, sex, race/ethnicity, insurance, smoking, pulmonary disease, immunological disease, liver disease, obesity, hypertension, chronic kidney disease, diabetes.