Table 4.
OR estimates and 95% CI of the number (N) and percentage (%) of birds with three levels of wing damage (unclipped, half-clipped and full-clipped) within a strain (white- and brown-feathered) with a keel bone fracture. An OR > 1 indicates that birds were more likely to have a keel bone fracture, whereas an OR less than 1 indicates that birds were less likely to have a keel bone fracture.
| strain | clipping status | week | N (%) | OR | 95% CI |
|---|---|---|---|---|---|
| white-feathered | unclipped | week 0 | 9 (37.5%) | ref. | ref. |
| week 6 | 10 (41.7%) | 1.2 | 0.36–3.91 | ||
| half-clipped | week 0 | 9 (50.0%) | ref. | ref. | |
| week 6 | 10 (55.6%) | 1.3 | 0.32–4.87 | ||
| full-clipped | week 0 | 7 (38.9%) | ref. | ref. | |
| week 6 | 8 (44.4%) | 1.3 | 0.32–4.98 | ||
| brown-feathered | unclipped | week 0 | 10 (50.0%) | ref. | ref. |
| week 6 | 10 (50.0%) | 1 | 0.28–3.60 | ||
| half-clipped | week 0 | 8 (50.0%) | ref. | ref. | |
| week 6 | 9 (56.3%) | 1.3 | 0.30–5.48 | ||
| full-clipped | week 0 | 3 (20.0%) | ref. | ref. | |
| week 6 | 7 (46.7%) | 3.5 | 0.64–19.06 |