Table 3.
Year | n |
aYearly survival rates (% ± s-x) |
|||||
0 | 1 | 2 | 3 | 4 | 5 | ||
Vaccination group | 310 | 97.05 ± 0.97 | 84.35 ± 2.10 | 76.42 ± 3.23 | 71.12 ± 3.43 | 66.51 ± 3.84 | 60.52 ± 4.57 |
Controll group | 257 | 93.16 ± 1.60 | 74.83 ± 2.51 | 62.50 ± 2.06 | 50.58 ± 1.99 | 45.57 ± 1.32 | 44.76 ± 0.81 |
aLife table χ2 test P < 0.005 of the two groups.