Table 3.
Logistic regression results for the factors significantly affecting the probability of overall infection of Radix auricularia (n = 354) and Lymnaea stagnalis (n = 171) in the four reservoirs of the Ruhr River.
| Snail species | Factor | Estimate | Wald statistics | p |
|---|---|---|---|---|
| R. auricularia | Snail height | 0.257 | 22.92 | < 0.0001 |
| Temperature | 0.247 | 12.59 | 0.0004 | |
| Dissolved oxygen | 0.290 | 9.03 | 0.0026 | |
| pH | -0.279 | 8.01 | 0.0047 | |
| L. stagnalis | Snail height | 0.188 | 18.99 | < 0.0001 |
| pH | -1.778 | 8.33 | 0.0039 | |
| Dissolved oxygen | 0.978 | 5.83 | 0.0157 | |
Infection coded 0 (uninfected) and 1 (infected)