Table 3. Adjusted relative risk of hospitalisations and deaths in fully vaccinated versus unvaccinated COVID-19 cases by age group, Estonia, Ireland, Luxembourg, Slovakia, as of weeks 01–45 2021.

Age (years)	Hospitalisations in fully vaccinated casesa		Deaths in fully vaccinated casesa
	aRRb	95% CI	aRRb	95% CI
18–49	0.37	0.32–0.44	0.09	0.02–0.48
50–64	0.25	0.22–0.28	0.14	0.05–0.38
65–79	0.33	0.28–0.40	0.16	0.14–0.18
≥ 80	0.58	0.51–0.66	0.28	0.24–0.34

aRR: adjusted relative risk; CI: confidence interval; COVID-19: coronavirus disease.

^a Reference group: unvaccinated.

^b Model adjusted for sex, underlying medical conditions and reporting country. The aRR are obtained by a negative binomial regression models with a standard error robust to country-related intra-cluster correlation.

Fully vaccinated cases received the complete primary vaccination series, i.e. one dose (COVID-19 Vaccine Janssen, Janssen-Cilag International NV, Beerse, Belgium) or two doses (Comirnaty/BNT162b2 mRNA, BioNTech-Pfizer, Mainz, Germany/New York, United States; Spikevax/mRNA-1273, Moderna, Cambridge, US; Vaxzevria/ChAdOx1 nCoV-19, Oxford-AstraZeneca, Cambridge, United Kingdom) of COVID-19 vaccine as per official recommendations.