Tab. I.

Absolute number, percentage of cases of invasive meningococcal disease and incidence rate (per 100,000 population) of IMD by age group and year, Italy, 2011-2017.

Year
	2011			2012			2013			2014			2015			2016			2017
Age group	N	%	Incidence	N	%	Incidence	N	%	Incidence	N	%	Incidence	N	%	Incidence	N	%	Incidence	N	%	Incidence
0-12 months	18	11.8%	3.24	17	12.4%	3.20	21	12.2%	4.01	21	12.8%	4.13	22	11.7%	4.43	22	9.7%	4.59	15	7.6%	3.21
1-4 years	23	15.1%	1.00	25	18.3%	1.13	27	15.7%	1.22	25	15.2%	1.13	18	9.5%	0.83	22	9.7%	1.05	19	9.6%	0.93
5-9 years	19	12.5%	0.67	13	9.5%	0.47	11	6.4%	0.39	11	6.7%	0.38	7	3.7%	0.24	16	7.1%	0.56	13	6.5%	0.46
10-14 years	11	7.2%	0.39	8	5.8%	0.29	13	7.6%	0.46	15	9.1%	0.53	10	5.3%	0.35	9	4.0%	0.32	12	6.1%	0.42
15-24 years	32	21.1%	0.53	22	16.1%	0.37	26	15.1%	0.44	18	10.9%	0.30	39	20.6%	0.66	51	22.5%	0.86	35	17.7%	0.59
25-64 years	36	23.7%	0.11	34	24.8%	0.10	51	29.6%	0.16	53	32.3%	0.16	68	36.0%	0.20	83	36.6%	0.25	79	39.9%	0.24
> 64 years	13	8.6%	0.11	18	13.1%	0.15	23	13.4%	0.18	21	12.8%	0.16	25	13.2%	0.19	24	10.6%	0.18	25	12.6%	0.18
Total	152	100%	0.25	137	100%	0.23	172	100%	0.29	164	100%	0.27	189	100%	0.31	227	100%	0.37	198	100%	0.33