Table 2.
Estimated regression coefficient (β) of a Cox proportional hazard model for tested covariates that may have an effect on the death risk of Meteorus pulchricornis offspring when the maternal wasps were treated with insecticidesa
| Treatments | β | SE (β) | exp (β) | Z-value | P |
|---|---|---|---|---|---|
| Acetone control | 0 | – | 1 | ||
| Phoxim (LC30) | 1.31 | 0.16 | 3.71 | 8.10 | <0.001 |
| Phoxim (LC50) | −0.56 | 0.17 | 0.57 | −3.35 | <0.001 |
| Cypermethrin (LC30) | 0.20 | 0.12 | 1.22 | 1.66 | 0.097 |
| Cypermethrin (LC50) | −0.11 | 0.14 | 0.90 | −0.75 | 0.45 |
aThe overall significance of Cox proportional hazard model was assessed by likelihood ratio test (χ 2 = 83.78, df = 4, 481; P < 0.001).