Table 3.
Parameters affecting insects’ death
| Explanatory variable | ndf | Wald χ2 | P |
|---|---|---|---|
| (A) Flies, Dependent variable = death (0/1) | |||
| VE | 1 | 6·0786 | 0·0137 |
| pH | 1 | 2·1514 | 0·1424 |
| FallOrientation | 1 | 2·8056 | 0·0939 |
| LogTime | 1 | 15·2531 | <0·0001 |
| pH × FallOrientation | 1 | 3·8491 | 0·0498 |
| (B) Ants, Dependent variable = death (0/1) | |||
| FluidOrigin | 4 | 6·3020 | 0·1777 |
| Visco | 1 | 31·6832 | <0·0001 |
| FluidAge(FluidOrigin) | 7 | 25·8307 | 0·0005 |
Results of a logistic regression model testing for the effects of fluid origin, fluid age, fluid viscoelasticity (‘Visco’ as a quantitative variable and ‘VE’ as a qualitative variable), fluid pH, insect species and their interactions on death rates of (A) flies and (B) ants. Only significant variables were kept in the final models according to the backward selection procedure.