Table 2.
Descriptive and univariable logistic regression results for breed-derived risk factors for aural haematoma during 2016 in dogs under primary veterinary care in the VetCompass™ Programme in the UK. Column percentages shown in brackets.
| Variable | Category | Case No. (%) | Non-case No. (%) | Odds ratio | 95% CI* | Category P-value | Variable P-value |
|---|---|---|---|---|---|---|---|
| Purebred | Crossbred | 472 (0.24) | 194,192 (99.76) | Base | < 0.001 | ||
| Designer | 29 (0.06) | 52,657 (99.94) | 0.23 | 0.16–0.30 | < 0.001 | ||
| Purebred | 1,746 (0.27) | 653,126 (99.73) | 1.10 | 0.99–1.22 | 0.067 | ||
| Kennel Club Recognised Breed | Not recognised | 547 (0.21) | 261,802 (99.79) | Base | < 0.001 | ||
| Recognised | 1,700 (0.27) | 638,173 (99.73) | 1.27 | 1.16–1.40 | < 0.001 | ||
| Kennel Club Breed Group | Not Kennel Club recognised breed | 547 (0.21) | 261,802 (99.79) | Base | < 0.001 | ||
| Terrier | 622 (0.43) | 145,292 (99.57) | 2.05 | 1.83–2.30 | < 0.001 | ||
| Gundog | 543 (0.40) | 135,115 (99.60) | 1.92 | 1.71–2.17 | < 0.001 | ||
| Working | 113 (0.29) | 39,102 (99.71) | 1.38 | 1.13–1.69 | 0.002 | ||
| Pastoral | 136 (0.26) | 52,845 (99.74) | 1.23 | 1.02–1.49 | 0.030 | ||
| Utility | 207 (0.20) | 102,455 (99.80) | 0.97 | 0.83–1.13 | 0.681 | ||
| Hound | 20 (0.06) | 31,396 (99.94) | 0.30 | 0.20–0.48 | < 0.001 | ||
| Toy | 59 (0.04) | 131,968 (99.96) | 0.21 | 0.16–0.28 | < 0.001 | ||
| Ear carriage | Erect | 306 (0.19) | 162,445 (99.81) | Base | < 0.001 | ||
| V-shaped drop | 538 (0.44) | 123,008 (99.56) | 2.32 | 2.02–2.67 | < 0.001 | ||
| Semi-erect | 688 (0.35) | 196,318 (99.65) | 1.86 | 1.63–2.13 | < 0.001 | ||
| Unavailable | 503 (0.20) | 251,064 (99.80) | 1.06 | 0.92–1.23 | 0.396 | ||
| Pendulous | 214 (0.13) | 170,424 (99.87) | 0.67 | 0.60–0.79 | < 0.001 | ||
| Haircoat length | Short | 1,332 (0.39) | 338,414 (99.61) | Base | < 0.001 | ||
| Medium | 347 (0.18) | 191,589 (99.82) | 0.46 | 0.41–0.52 | < 0.001 | ||
| Long | 62 (0.07) | 91,961 (99.93) | 0.17 | 0.13–0.22 | < 0.001 | ||
| Unavailable | 508 (0.18) | 281,295 (99.82) | 0.46 | 0.41–0.51 | < 0.001 | ||
| Skull conformation | Mesocephalic | 1,285 (0.31) | 416,864 (99.69) | Base | < 0.001 | ||
| Brachycephalic | 289 (0.17) | 166,612 (99.83) | 0.56 | 0.50–0.64 | < 0.001 | ||
| Dolichocephalic | 172 (0.25) | 69,650 (99.75) | 0.80 | 0.68–0.94 | 0.006 | ||
| Unavailable | 503 (0.20) | 250,133 (99.80) | 0.65 | 0.59–0.72 | < 0.001 | ||
| Chondrodystrophic | Not chondrodystrophic | 1,417 (0.46) | 308,073 (99.54) | Base | < 0.001 | ||
| Chondrodystrophic | 329 (0.10) | 345,012 (99.90) | 0.21 | 0.18–0.23 | < 0.001 | ||
| Unavailable | 503 (0.20) | 250,174 (99.80) | 0.44 | 0.39–0.48 | < 0.001 | ||
| Spaniel | Non spaniel-type | 1,667 (0.29) | 576,258 (99.71) | Base | < 0.001 | ||
| Spaniel-type | 79 (0.10) | 76,868 (99.90) | 0.36 | 0.28–0.45 | < 0.001 | ||
| Unavailable | 503 (0.20) | 250,133 (99.80) | 0.70 | 0.63–0.77 | < 0.001 |
*CI confidence interval.