Table 2 Clusters of emerging snail-infested sites inside embankments from 1949 to 2016
Clusters | Radius (km2) | Time frame | Duration of cluster (years) | Observed number | Expected number | Observed/expected | P-value |
|---|---|---|---|---|---|---|---|
1 | 6.89 | 1978–1980 | 3 | 227 | 16.70 | 13.59 | < 0.01 |
2 | 20.67 | 1956 | 1 | 760 | 263.98 | 2.88 | < 0.01 |
3 | 13.53 | 1970 | 1 | 136 | 5.51 | 24.67 | < 0.01 |
4 | 33.17 | 1963–1965 | 3 | 162 | 18.77 | 8.63 | < 0.01 |
5 | 13.81 | 1953–1955 | 3 | 162 | 18.83 | 8.60 | < 0.01 |
6 | 12.34 | 1984–2011 | 28 | 88 | 4.36 | 20.19 | < 0.01 |
7 | 12.43 | 1952–1953 | 2 | 82 | 4.31 | 19.04 | < 0.01 |
8 | 23.20 | 1960–1968 | 9 | 412 | 149.60 | 2.75 | < 0.01 |
9 | 7.33 | 2006–2015 | 10 | 44 | 0.95 | 46.26 | < 0.01 |
10 | 11.07 | 1958 | 1 | 84 | 7.66 | 10.97 | < 0.01 |
11 | 9.91 | 1961–1962 | 2 | 119 | 19.97 | 5.96 | < 0.01 |