Variable | Odds ratio | 95% CIa | P-value |
---|---|---|---|
Breed |  |  | < 0.001 |
 Arabian | 3.9 | 0.6, 25.1 | 0.159 |
 American Saddlebred | 2.5 | 0.5, 12.5 | 0.257 |
 Mixed Equine | 2.3 | 0.5, 11.5 | 0.308 |
 Quarter Horse | 2.2 | 0.5, 8.7 | 0.277 |
 Standardbred | 15.0 | 3.7, 60.4 | 0.001 |
 Thoroughbred | 7.0 | 2.4, 19.8 | 0.000 |
 Tennessee Walking Horse | 0.8 | 0.2, 3.6 | 0.730 |
 Other | . | . | . |
Age | Â | Â | 0.020 |
 Aborted Fetus 0 years | 0.7 | 0.4, 1.2 | 0.171 |
  < 1 year | 1.6 | 1.0, 2.6 | 0.042 |
 1–2 years | 1.8 | 0.6, 4.9 | 0.266 |
 2–4 years | 1.5 | 0.7, 3.1 | 0.275 |
  > 4 years | . | . | . |