Table 1. Parameter estimates for type III general linear model (GLM) assessing the influence of wintering area (i.e., Africa, America and Europe) and breeding colony (i.e., Bjørnøya, Iceland and Shetland) on feather corticosterone levels of breeding great skua (Stercorarius skua).
| 95% confidence interval | ||||||
| Parameter estimates | Value | s.e. | t value | p value | lower | upper |
| Intercept | 33.72 | 3.90 | 8.65 | <0.0001 | 25.97 | 41.47 |
| Colony (Iceland) | −1.31 | 4.97 | −0.26 | 0.79 | −11.19 | 8.57 |
| Colony (Shetland) | −7.91 | 4.44 | −1.78 | 0.08 | −16.72 | 0.91 |
| Winter (America) | −10.09 | 4.59 | −2.20 | 0.03 | −19.21 | −0.97 |
| Winter (Europe) | −12.56 | 4.50 | −2.79 | <0.01 | −21.51 | −3.61 |
| Colony (Iceland) x Winter (America) | −1.39 | 5.94 | −0.23 | 0.82 | −13.20 | 10.42 |
| Colony (Shetland) x Winter (America) | NA | NA | NA | NA | NA | NA |
| Colony (Iceland) x Winter (Europe) | 4.40 | 6.27 | 0.70 | 0.48 | −8.05 | 16.86 |
| Colony (Shetland) x Winter (Europe) | 18.66 | 5.57 | 3.35 | <0.01 | 7.58 | 29.74 |
Parameter estimate values are given for the following factors: Colony: Bjørnøya; Winter: Africa. Numbers in bold indicate significant p-values (p<0.05). NA, not applicable; s.e., standard error.