Table 1. Analysis of deviance for expected gregarine abundance in the observational study, according to species identity, sex, age year and their interactions.
| Predictor | Df | Deviance | Residual deviance | Probability (χ2) |
| Null | 2712.2 | |||
| Species identity | 9 | 222.4 | 2489.7 | <0.001 |
| Sex | 1 | 415.4 | 2074.4 | <0.001 |
| Age | 2 | 327.8 | 1746.6 | <0.001 |
| Year | 1 | 2.2 | 1744.4 | 0.136 |
| Species identity: Sex | 9 | 26.7 | 1717.7 | 0.002 |
| Species identity: Age | 18 | 36.2 | 1681.5 | 0.007 |
| Sex: Age | 2 | 1.4 | 1680.0 | 0.487 |
| Sex: Year | 1 | 7.8 | 1672.2 | 0.005 |
| Species identity: Sex: Age | 18 | 61.4 | 1610.9 | <0.001 |