Table 2 Descriptive and univariable logistic regression results for non-breed-related signalment factors as predisposing factors for otitis externa 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% CIa | Category P-value | Variable P-value |
|---|---|---|---|---|---|---|---|
Adult (> 18 months) bodyweight (kg) | < 10.0 | 299 (18.33) | 5115 (24.71) | Base | < 0.001 | ||
10.0 - < 15.0 | 261 (16.00) | 2203 (10.64) | 2.03 | 1.70–2.41 | < 0.001 | ||
15.0 - < 20.0 | 144 (8.83) | 1550 (7.49) | 1.59 | 1.29–1.95 | < 0.001 | ||
20.0 - < 25.0 | 143 (8.77) | 1461 (7.06) | 1.67 | 1.36–2.06 | < 0.001 | ||
25.0 - < 30.0 | 116 (7.11) | 1234 (5.96) | 1.61 | 1.29–2.01 | < 0.001 | ||
30.0 - < 40.0 | 194 (11.89) | 1575 (7.61) | 2.11 | 1.74–2.55 | < 0.001 | ||
≥ 40.0 | 80 (4.90) | 549 (2.65) | 2.49 | 1.92–3.24 | < 0.001 | ||
Unavailable | 394 (24.16) | 7015 (33.89) | 0.96 | 0.82–1.12 | 0.612 | ||
Bodyweight relative to breed mean | Lower | 560 (34.33) | 7486 (36.16) | Base | < 0.001 | ||
Equal/Higher | 673 (41.26) | 6155 (29.73) | 1.46 | 1.30–1.64 | < 0.001 | ||
Unavailable | 398 (24.40) | 7061 (34.11) | 0.75 | 0.66–0.86 | < 0.001 | ||
Age (years) | < 1.0 years | 116 (7.11) | 2392 (11.55) | Base | < 0.001 | ||
1.0 - < 2.0 years | 251 (15.39) | 3027 (14.62) | 1.71 | 1.36–2.14 | < 0.001 | ||
2.0 - < 4.0 years | 347 (21.28) | 4111 (19.86) | 1.74 | 1.40–2.16 | < 0.001 | ||
4.0 - < 6.0 years | 258 (15.82) | 3195 (15.43) | 1.67 | 1.33–2.09 | < 0.001 | ||
6.0 - < 8.0 years | 225 (13.80) | 2573 (12.43) | 1.80 | 1.43–2.27 | < 0.001 | ||
8.0 - < 10.0 years | 179 (10.97) | 2069 (9.99) | 1.78 | 1.40–2.27 | < 0.001 | ||
10.0 - < 12.0 years | 132 (8.09) | 1441 (6.96) | 1.89 | 1.46–2.44 | < 0.001 | ||
≥ 12.0 years | 109 (6.68) | 1641 (7.93) | 1.37 | 1.05–1.79 | 0.22 | ||
Unavailable | 14 (0.86) | 253 (1.22) | 1.14 | 0.65–2.02 | 0.650 | ||
Sex | Female | 689 (42.24) | 9851 (47.58) | Base | < 0.001 | ||
Male | 939 (57.57) | 10,779 (52.07) | 1.25 | 1.12–1.38 | < 0.001 | ||
Unavailable | 3 (0.18) | 72 (0.35) | 0.60 | 0.19–1.90 | 0.380 | ||
Neuter | Entire | 808 (49.54) | 11,353 (54.84) | Base | < 0.001 | ||
Neutered | 820 (50.28) | 9277 (44.81) | 1.24 | 1.12–1.37 | < 0.001 | ||
Unavailable | 3 (0.18) | 72 (0.35) | 0.59 | 0.18–1.86 | 0.365 | ||
Insurance | Non-insured | 1329 (81.48) | 18,025 (87.07) | Base | < 0.001 | ||
Insured | 302 (18.52) | 2677 (12.93) | 1.53 | 1.34–1.75 | < 0.001 |