Table 6. The previous history concerning hospitalization due to flu infection, receiving a flu vaccination, and frequency of vaccination (total number = 611, ever vaccinated = 267).

	Frequency (%)
Admission to the hospital due to flu infection	70 (11.5)
Have you received the influenza vaccine before?	267 (43.7)
For those who vaccinated (n = 267), how regularly do they take the vaccine?
Yearly	118 (44.2)
Every 2 years	53 (19.9)
Every 3 years	78 (29.2)
Other	18 (6.7)