Table 4.
Parameters affecting insects’ time to death
| Explanatory variable |
ndf | Wald χ2 | P |
|---|---|---|---|
| (A) Flies, Dependent variable = DeathTime (right-censored at 300 s) | |||
| pH | 1 | 9·8366 | 0·0017 |
| FluidOrigin | 4 | 50·9673 | <0·0001 |
| FluidAge(FluidOrigin) | 8 | 81·6622 | <0·0001 |
| InsectSpecies | 1 | 7·5618 | 0·0060 |
| FallOrientation | 1 | 18·9018 | <0·0001 |
| (B) Ants, Dependent variable = DeathTime (right-censored at 300 s) | |||
| FluidOrigin | 1 | 3·1756 | 0·0747 |
| FluidAge(FluidOrigin) | 3 | 13·1007 | 0·0044 |
| InsectSpecies | 1 | 25·7284 | <0·0001 |
Results of a right-censored survival time model (censured at 300 s) testing for the effects of fluid origin, fluid age, fluid viscoelasticity (‘VE’ as a binary variable and ‘Visco’ as a quantitative variable), insect species, fall orientation, pH and their interactions on time to death of (A) flies and (B) ants. Only significant variables were kept in the final models according to the backward selection procedure.