Table 2.

Comparison of Hepatitis A Seroprevalence Rate by Age in the Tainan Area in Different Studies

Study	Wu et al., 1993[12]			Liu et al., 1994[7]			Wang et al., 2001[8]			Current study
(Time)	(1989-1991)			(1992)			(1998)			(2005)
Age (years)	Year of birth	Case/Total	Rate (%)	Year of birth	Case/Total	Rate (%)	Year of birth	Case/Total	Rate (%)	Year of birth	Case/Total	Rate (%)
1-2	1987-1990	0/30	0.0	1990-1991	3/83	3.6	1996-1997	0/32	0.0
3-4	1985-1988	1/32	3.1	1988-1989	2/70	2.9	1994-1995	0/59	0.0
5-6	1983-1986	0/144	0.0	1986-1987	2/86	2.3	1992-1993	1/91	1.1
7-8	1981-1984	5/268	1.9	1984-1985	3/82	3.7	1990-1991	1/124	0.8
9-10	1979-1982	14/287	4.9	1982-1983	3/90	3.3	1988-1989	2/147	1.4
11-12	1977-1980	19/315	6.0	1980-1981	3/73	4.1	1986-1987	0/74	0.0
13-15	1974-1978	106/406	26.1	1977-1979	8/35	22.9	1983-1985	1/51	2.0
16-19				1973-1976	17/28	60.7	1979-1982	2/41	4.9
20-24				1968-1972	22/35	62.9	1974-1978	16/132	12.1	1981-1985	79/2580	3.1
25-29				1963-1967	26/37	70.2	1969-1973	16/44	36.4	1976-1980	855/5587	15.3
30-39				1953-1962	24/26	92.3	1959-1968	29/44	65.9	1966-1975	1574/3458	45.2
40-49				1943-1952	20/20	100.0	1949-1958	41/46	89.1	1956-1965	79/107	73.8
> 50				< 1942	25/25	100.0	< 1948	32/34	94.1	< 1955	5/8	62.5