Table 1. Effect of LPS on body mass and feather length on day 2 and 3 post-injection.
| Source of variation | Coefficient | χ2 | df | P |
| Day 2 post-injection | ||||
| Body mass (n = 202) | ||||
| Treatment | −0.492 (0.087) | 29.25 | 1 | <0.0001 |
| Sex | 0.089 (0.103) | 0.74 | 1 | 0.388 |
| Feather length (n = 201) | ||||
| Treatment | −0.684 (0.321) | 4.59 | 1 | 0.032 |
| Sex | −0.647 (0.342) | 1.90 | 1 | 0.168 |
| Treatment×sex | −1.090 (0.444) | 6.07 | 1 | 0.014 |
| Day 3 post-injection | ||||
| Body mass (n = 193) | ||||
| Treatment | −0.251 (0.114) | 4.83 | 1 | 0.028 |
| Sex | 0.053 (0.133) | 0.16 | 1 | 0.691 |
| Feather length (n = 193) | ||||
| Treatment | −0.244 (0.247) | 0.99 | 1 | 0.320 |
| Sex | 0.216 (0.278) | 0.62 | 1 | 0.430 |
Final models reporting the effect of treatment (LPS or control), sex and their interaction (where significant) on body mass and third primary feather length of nestlings both two and three days after the experimental manipulation. The number of nestlings in the sample is given in parentheses. See Statistical Methods for details.