Table 3.
Descriptive and univariable logistic regression results for non-breed-related demographic risk factors evaluated 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 |
|---|---|---|---|---|---|---|---|
| Adult (> 18 months) bodyweight (kg) | < 10.0 | 145 (0.07) | 213,204 (99.93) | Base | < 0.001 | ||
| 10.0– < 15.0 | 170 (0.17) | 98,218 (99.83) | 2.54 | 2.04–3.18 | < 0.001 | ||
| 15.0– < 20.0 | 265 (0.38) | 69,122 (99.62) | 5.64 | 4.60–6.90 | < 0.001 | ||
| 20.0– < 25.0 | 344 (0.54) | 63,555 (99.46) | 7.96 | 6.55–9.67 | < 0.001 | ||
| 25.0– < 30.0 | 298 (0.55) | 53,472 (99.45) | 8.19 | 6.72–10.00 | < 0.001 | ||
| 30.0– < 40.0 | 448 (0.64) | 69,477 (99.36) | 9.48 | 7.86–11.44 | < 0.001 | ||
| ≥ 40.0 | 170 (0.65) | 26,081 (99.35) | 9.58 | 7.68–11.97 | < 0.001 | ||
| Unavailable | 409 (0.13) | 310,130 (99.87) | 1.94 | 1.60–2.34 | < 0.001 | ||
| Bodyweight relative to breed mean | Lower | 765 (0.24) | 316,573 (99.76) | Base | < 0.001 | ||
| Equal/Higher | 1,073 (0.39) | 274,419 (99.61) | 1.62 | 1.47–1.78 | < 0.001 | ||
| Unavailable | 411 (0.13) | 312,267 (99.87) | 0.55 | 0.48–0.62 | < 0.001 | ||
| Age (years) | < 1.0 | 48 (0.05) | 103,820 (99.95) | 0.42 | 0.31–0.58 | < 0.001 | < 0.001 |
| 1.0– < 2.0 | 64 (0.05) | 130,513 (99.95) | 0.45 | 0.34–0.60 | < 0.001 | ||
| 2.0– < 4.0 | 194 (0.11) | 178,055 (99.89) | Base | ||||
| 4.0– < 6.0 | 300 (0.21) | 139,711 (99.79) | 1.97 | 1.64–2.36 | < 0.001 | ||
| 6.0– < 8.0 | 429 (0.38) | 112,969 (99.62) | 3.49 | 2.94–4.13 | < 0.001 | ||
| 8.0– < 10.0 | 512 (0.56) | 90,490 (99.44) | 5.19 | 4.40–6.13 | < 0.001 | ||
| 10.0– < 12.0 | 414 (0.63) | 65,823 (99.37) | 5.77 | 4.87–6.85 | < 0.001 | ||
| ≥ 12.0 | 272 (0.39) | 69,466 (99.61) | 3.59 | 2.99–4.32 | < 0.001 | ||
| Unavailable | 16 (0.13) | 12,412 (99.87) | 1.18 | 0.71–1.97 | 0.518 | ||
| Sex | Female | 1,118 (0.26) | 430,574 (99.74) | Base | 0.005 | ||
| Male | 1,128 (0.24) | 468,459 (99.76) | 0.93 | 0.85–1.01 | 0.074 | ||
| Unavailable | 3 (0.07) | 4,226 (99.93) | 0.27 | 0.09–0.85 | 0.025 | ||
| Neuter | Entire | 1,164 (0.24) | 492,175 (99.76) | Base | 0.001 | ||
| Neutered | 1,082 (0.27) | 406,860 (99.73) | 1.12 | 1.04–1.22 | 0.006 | ||
| Unavailable | 3 (0.07) | 4,224 (99.93) | 0.30 | 0.10–0.93 | 0.038 | ||
| Insurance | Non-insured | 1,872 (0.24) | 786,076 (99.76) | Base | < 0.001 | ||
| Insured | 377 (0.32) | 117,183 (99.68) | 1.35 | 1.21–1.51 | < 0.001 |
*CI confidence interval.