Table 2.

ARF annual incidence rates expressed as cases per 100,000 population according to LR and HR criteria by year.

Year	School-age population*	Incidence with LR criteria	Incidence with HR criteria	Diagnosis with LR criteria (%)	Diagnosis with HR criteria (%)	HR impact (%)
2010	328,525	1.52	1.52	100	0	0
2011	329,234	0.91	0.91	100	0	0
2012	329,626	3.03	3.94	77	23	30
2013	330,341	1.82	3.03	60	40	67
2014	331,182	3.32	3.62	92	8	9
2015	331,848	3.62	5.73	63	37	58
2016	331,719	1.51	1.51	100	0	0
2017	331,140	4.23	6.04	70	30	43
2018	330,020	3.33	4.24	79	21	27
2019	327,293	5.81	7.33	79	21	26

^*Population at risk data derived by ISTAT census.