Table 4.

Number of laboratory-confirmed influenza infections and person-years by vaccination status and vaccine for the population-based cohort study (Finland), 2021–2022.

Analysis	Age group	Vaccinated			Unvaccinated
		Number of influenza infections (mixed setting)	Number of hospitalized influenza infections *	Person-years	Number of influenza infections	Number of hospitalized influenza infections *	Person-years
Any vaccine	6 months−6 years	29	8	37,508	93	17	132,315
	≥65 years	118	51	304,570	91	41	362,229
Vaxigrip tetra	6 months−6 years	6	1	8,747	93	17	132,315
	≥65 years	118	51	300,590	91	41	362,229
Fluenz Tetra	2–6 years	22	7	28,508	79	16	109,650

^*Infections timely associated with hospitalization.

py, person-years; unvac, unvaccinated; vac, vaccinated.