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Table 3 Final mixed-effects multivariable logistic regression model for risk factors associated with a diagnosis of patellar luxation in dogs attending primary-care veterinary practices in England

From: The epidemiology of patellar luxation in dogs attending primary-care veterinary practices in England

Variable Category Odds Ratio 95 % CI P-value
Breed Crossbred Base   
  Other breed-types 0.4 0.3–0.5 <0.001
  Bichon 3.0 2.0–4.4 <0.001
  Bulldog 2.9 1.7–5.0 <0.001
  French Bulldog 5.4 3.1–9.3 <0.001
  Chihuahua 5.9 4.4–7.9 <0.001
  Lhasa Apso 3.1 1.9–5.1 <0.001
  Pomeranian 6.5 4.0–10.7 <0.001
  Pug 3.7 2.3–5.8 <0.001
  Shih-tzu 1.2 0.8–2.0 0.392
  Cavalier King Charles Spaniel 2.5 1.8–3.5 <0.001
  Jack Russell Terrier 1.5 1.1–2.0 0.008
  Staffordshire Bull Terrier 0.5 0.3–0.7 0.001
  West Highland White Terrier 2.0 1.4–2.8 <0.001
  Yorkshire Terrier 5.5 4.3–7.1 <0.001
Breed relative bodyweighta At or above breed mean Base   
  Below breed mean 1.4 1.2–1.6 <0.001
  No recorded weight 0.3 0.2–0.4 <0.001
Age (years) <3.0 Base   
  3.0 - <6.0 0.8 0.7–1.0 0.019
  6.0 - <9.0 0.8 0.6–1.0 0.017
  9.0 - <12.0 0.7 0.5–0.8 0.001
  > or = 12.0 0.4 0.3–0.5 <0.001
  No age available 158.7 114.8–219.5 <0.001
Sex Male Base   
  Female 1.3 1.1–1.5 <0.001
  Unknown 0.1 0.0–0.9 0.038
Neutered Entire Base   
  Neutered 2.4 1.8–3.2 <0.001
  Unknown 1.2 0.9–1.6 0.222
Insured Uninsured Base   
  Insured 1.9 1.6–2.3 <0.001
  Unknown 1.1 0.9–1.3 0.488
  1. Breed relative bodyweighta for maximum bodyweight recorded in dogs aged over 18 months compared to the mean bodyweight of all study dogs for breed and sex