Table 4.

OR^* risk analysis for key negative outcomes, approximately 4 weeks after final VBO, in 58 cats with otitis media-interna, transferred from an institutional hoarding environment

	Moderate/severe nasopharyngeal signs at recheck				Moderate/severe otitis externa at recheck				Clinical signs of otitis interna at recheck
	n	OR	95% CI	P value	n	OR	95% CI	P value	n	OR	95% CI	P value
Preoperative variables
FIV-positive	55	2.75	0.67–11.2	0.16	55	2.05	0.58–7.24	0.27	54	0.49	0.14–1.67	0.25
Moderate/severe nasopharyngeal signs	–	–	–	–	55	1.41	0.42–4.77	0.58	53	0.54	0.18–1.64	0.27
Moderate/severe otitis externa	55	0.50	0.11–2.39	0.39	–	–	–	–	54	0.78	0.11–2.98	0.72
Purulent aural discharge	55	0.71	0.16–3.10	0.64	55	2.15	0.63–7.42	0.22	54	0.29	0.08–1.04	0.06
Ruptured tympanic membrane	33	0.18	0.02–1.71	0.14	33	1.60	0.33–7.65	0.56	32	2.10	0.49–9.00	0.32
Polyp	55	0.86	0.19–3.79	0.84	55	0.47	0.11–1.97	0.30	54	2.50	0.78–7.97	0.12
Moderate/severe bulla wall thickening	51	0.77	0.19–3.15	0.72	51	1.31	0.38–4.50	0.67	50	0.38	0.11–1.24	0.12
Otitis interna	55	0.64	0.15–2.82	0.56	55	4.35	1.21–15.70	0.02	–	–	–	–
SEZ cultured	47	1.80	0.39–8.27	0.45	47	2.67	0.61–11.70	0.19	46	1.08	0.33–3.56	0.90
Surgical variables
Two VBO surgeries	55	10.29	1.20–88.07	0.07	55	0.86	0.26–2.91	0.81	54	1.06	0.36–3.15	0.92
Generalist surgeon	55	3.69	0.89–15.27	0.07	55	3.64	1.03–12.87	0.045	54	1.77	0.56–5.57	0.44

^*Odds ratios reflect risk of the outcomes listed compared with absence of these outcomes. Values in bold are statistically significant.

CI = confidence interval; OR = odds ratio; FIV = feline immunodeficiency virus; SEZ = Streptococcus equi suspecies zooepidemicus; VBO = ventral bulla osteotomy