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Results of generalized linear model for field prevalence of infection
| Wald χ2 | df | P | |
|---|---|---|---|
| Intercept | 1,217.7 | 1 | <0.001 |
| Site | 338.1 | 12 | <0.001 |
| Year | 97.3 | 9 | <0.001 |
| Site × year | 270.2 | 100 | <0.001 |
| Length | 787.4 | 1 | <0.001 |
Note: Site, year, and their interaction are predictors of the probability that an individual female snail is infected with Microphallus. Snails were sampled at 12 or 13 shoreline sites from 2006 to 2015. Shell length is a covariate.
