Neuter status as a risk factor for canine intervertebral disc herniation (IVDH) in dachshunds: a retrospective cohort study

Table 5 Incidence rate and risk of IVDD in dachshunds aged between 36 and 120 months

Sex and neuter status	DYAR	Incidence (No. of cases)	Incidence per 1000 DYAR	Mean risk of IVDH per DYAR	RR compared with entire animals	RR compared with late-neutered animals
Entire bitches	838	45	54	5%	1	/
Bitches neutered < 12 months	456	52	114	11%	2.12 (1.44–3.11)	1.37 (0.93–2.01)
Bitches neutered > 12 months^a	554	46	83	8%	1.55 (1.04–2.30)	1
All neutered bitches	1010	98	97	10%	1.81 (1.28–2.54)	/
Entire males	936	55	58.7	6%	1	/
Males neutered < 12 months	574	52	90.6	9%	1.54 (1.07–2.22)	1.38 (0.96–1.99)
Males neutered > 12 months^a	365	24	65.8	7%	1.12 (0.7–1.78)	1
All neutered males	940	76	80.9	8%	1.38 (0.98–1.93)	/

Figures shown in bold are considered statistically significant at the 95% confidence level
95% confidence intervals are shown in brackets
DYAR Dog years at risk
RR Risk ratio
^aBitches and dogs neutered > 12 months are “late neutered”

ISSN: 2662-9380