Table 3.
Association of the development of RAO with signalment and environmental factors in the unrelated replication population.
| Variable | HOARSI Second Assessment | |||
|---|---|---|---|---|
| 1 or 2 (healthy/IAD) | 3 or 4 (RAO) | Total | P‐value | |
| Age | ||||
| 5–12 years | 47 (92%) | 4 (8%) | 51 (100%) | P = .48 |
| 13–24 years | 32 (86.5%) | 5 (13.5%) | 37 (100%) | |
| Total | 79 (90%) | 9 (10%) | 88 (100%) | |
| Sex | ||||
| Stallions and geldings | 37 (90%) | 4 (10%) | 41 (100%) | P = 1.0 |
| Mares | 42 (89%) | 5 (11%) | 47 (100%) | |
| Total | 79 (90%) | 9 (10%) | 88 (100%) | |
| Coat color | ||||
| Brown | 46 (87%) | 7 (13%) | 53 (100%) | P = .31 |
| Other colors | 33 (94%) | 2 (6%) | 35 (100%) | |
| Total | 79 (90%) | 9 (10%) | 88 (100%) | |
| Bedding | ||||
| Straw | 66 (88%) | 9 (12%) | 75 (100%) | P = .35 |
| Without straw | 13 (100%) | 0 (0%) | 13 (100%) | |
| Total | 79 (90%) | 9 (10%) | 88 (100%) | |
| Time outdoors | ||||
| 0–4 hours | 34 (92%) | 3 (8%) | 37 (100%) | P = .73 |
| 4‐multiple hours | 45 (88%) | 6 (12%) | 51 (100%) | |
| Total | 79 (90%) | 9 (10%) | 88 (100%) | |
RAO, recurrent airway obstruction; IAD, inflammatory airway disease.