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

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

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 monthsa 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 monthsa 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) /
  1. Figures shown in bold are considered statistically significant at the 95% confidence level
  2. 95% confidence intervals are shown in brackets
  3. DYAR Dog years at risk
  4. RR Risk ratio
  5. aBitches and dogs neutered > 12 months are “late neutered”