Fig. 2

When relative humidity is low, broods of cort-implanted females had higher risk of failure than control broods, but this difference disappears when relative humidity is high. Predicted values (relative risk of nest failure, i.e., daily mortality relative to the mean) from the best-supported Cox proportional hazard model (see Table 2a) are plotted in relation to relative humidity and the treatment. Solid and dashed lines represent cort and control groups, respectively, and the grey bands represent the standard error of the predicted values. A loess smoother was applied to the predicted values to facilitate interpretation. The non-linearity of the predictions is due to the effect of maximum temperature in the model