Table 2. Age-specific incidence of VH in Taiwan during 2001-2010.

Age group (a)	Incidence case			Population (person-years)1			Incidence rate per 104/year
	Female	Male	Total	Female	Male	Total	Female	Male	Total
<40	292	417	709	2 944 762	3 063 450	6 008 212	1.0	1.4	1.2
40-59	1166	1252	2418	1 103 006	1 083 983	2 186 989	10.6	11.5	11.1
≥60	636	616	1252	472 917	474 939	947 856	13.4	13.0	13.2
Total	2094	2285	4379	4 520 684	4 622 372	9 143 057	4.6	4.9	4.8

¹Person-years means the total years of follow-up in population who were at risk.