Study (year) | Wu et al., 1993[12] (1989-1991) | Current (2005) | Â | Liu et al., 1994[7] (1992) | Current (2005) | Â | Wang et al., 2001[8] (1998) | Current (2005) | ||||||
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Birth Years | Case/Total | Rate (%) | Case/Total | Rate (%) | Birth Years | Case/Total | Rate (%) | Case/Total | Rate (%) | Birth Years | Case/Total | Rate (%) | Case/Total | Rate (%) |
1984-1986 | 0/17 | 0.0 | 21/612 | 3.4 | 1984-1985 | 3/82 | 3.7 | 21/521 | 4.0 | 1983-1985 | 1/51 | 2.0 | 33/934 | 3.5 |
1983-1985 | 0/127 | 0.0 | 33/934 | 3.5* | 1982-1983 | 3/90 | 3.3 | 26/1107 | 2.3 | 1979-1982 | 2/41 | 4.9 | 163/3913 | 4.2 |
1982-1984 | 2/132 | 1.5 | 38/1437 | 2.6 | 1980-1981 | 3/73 | 4.1 | 105/2014 | 5.2 | Â | Â | Â | Â | Â |
1981-1983 | 3/136 | 2.2 | 58/2058 | 2.8 | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
1980-1982 | 5/145 | 3.4 | 119/2078 | 5.7 | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
1979-1981 | 9/142 | 6.3 | 249/3219 | 7.7 | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |