Table 4.

Estimated age-specific peak-incidence (peak-inc.) (per 1000) and cumulative attack rate (AR) (%) of H1N1 infections in the Italian population obtained with the TVR with-overdispersion models (Baseline, Susceptibility and Immunity variants). The attack rate is computed on the time period starting from week 31–2009 to week 7–2010. Mean and, in brackets, 5 to 95 percentile interval.

Estimates at the Italian population level
	Baseline		Susceptibility		Immunity
	peak-inc.	AR	peak-inc.	AR	peak-inc.	AR
0–4 years	80.7	47.3	48.8	30.8	44.2	28.1
	(68.6, 97.0)	(40.5, 55.2)	(36.4, 63.3)	(26.6, 35.2)	(32.0, 56.1)	(24.1, 31.9)
5–14 years	92.9	52.5	86.1	52.9	79.2	49.0
	(76.8, 108.6)	(47.9, 56.6)	(66.8, 107.0)	(47.5, 58.2)	(60.4, 98.4)	(43.6, 53.7)
15–64 years	21.1	12.5	43.9	27.8	38.7	24.7
	(16.7, 27.2)	(9.8, 16.0)	(32.8, 56.8)	(24.0, 31.6)	(28.1, 48.9)	(21.3, 27.8)
65+ years	7.6	4.5	15.6	9.9	13.7	8.7
	(5.7, 10.3)	(3.4, 6.0)	(11.3, 20.6)	(8.3, 11.6)	(9.8, 17.8)	(7.4, 10.1)
overall	27.4	16.3	42.1	26.7	37.5	23.9
	(23.4, 33.1)	(14.3, 18.9)	(31.5, 54.0)	(23.2, 30.2)	(27.5, 47.2)	(20.7, 26.9)