Fig. 1.

Forest plots depicting the association between selected features of the study cohort (citizens who completed scheduled vaccination plan with three doses) and the odds of severe COVID‐19 illness.

Note: The analysis included 4917 patients who, starting from at least 14 days after completing the scheduled vaccination (with three doses), experienced COVID‐19 hospital admission, including those in an intensive care unit, or death, and 49,170 controls randomly selected to be 1:10 matched for the date of vaccination completion and municipality of residence, and for not having yet experienced severe illness on the date on which the corresponding case experienced it (index date). The number of cases and controls and the corresponding column percentage are reported for each feature. Conditional logistic regression models including all the considered features as covariates were fitted for estimating odds ratios and corresponding 95% confidence interval.