Sexa |  | C | P | C2 | P2 | C × P |
---|
Female | βb | − 0.0044 | 0.0068 | 0.00001 | − 0.00003 | 0.00001 |
 | Χ2 | 17.04*** | 0.02NS | 21.45*** | 36.25*** | 4.80* |
Male | βb |  | 0.0081 |  | − 0.00004 |  |
 | Χ2 |  | 11.408*** |  | 11.513** |  |
- Type III Wald Chi-square test with associated P-values: NS non-significiant, P > 0.05, *P < 0.05, **P < 0.01, ***P < 0.001
- aFor each sex, we fitted a linear mixed effect orthogonal polynomial regression with replicate vial as a random factor and removed non-significant parameters
- bParameter values for the response surface are for the non-orthogonal polynomial regression to facilitate interpretation