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Table 2 Comparative demography between three individual extreme brachycephalic breed types (Bulldog, French Bulldog, Pug) and three other breed types (moderate brachycephalic: Yorkshire Terrier, non-brachycephalic: Border Terrier, West Highland White Terrier) of dogs attending primary-care veterinary practices in England (200 dogs of each breed type)

From: Epidemiological associations between brachycephaly and upper respiratory tract disorders in dogs attending veterinary practices in England

Variable Category Bulldog No. (%) French bulldog No. (%) Pug No. (%) Border terrier No. (%) West highland white terrier No. (%) Yorkshire terrier No. (%) P-value
Sex/neuter Female entire 80 (40.4) 83 (42.6) 73 (37.1) 52 (26.0) 51 (25.5) 57 (28.5) <0.001
  Female neutered 15 (7.6) 11 (5.6) 17 (8.6) 36 (18.0) 43 (21.5) 36 (18.0)  
  Male entire 87 (43.9) 94 (48.2) 88 (44.7) 74 (37.0) 66 (33.0) 71 (35.5)  
  Male neutered 16 (8.1) 7 (3.6) 19 (9.6) 38 (19.0) 40 (20.0) 36 (18.0)  
Insured Insured 49 (24.5) 20 (10.0) 34 (17.0) 53 (26.5) 60 (30.0) 46 (23.0) <0.001
  Not insured 151 (75.5) 180 (90.0) 166 (83.0) 147 (73.5) 140 (70.0) 154 (77.0)  
Bodyweight: Median (IQRa, range)   27.7 (23.6–31.0, 11.4–41.0) 12.2 (11.0–14.0, 1.6–19.0) 8.9 (8.0–10.2, 4.9–14.1) 10.0 (8.6–11.2, 4.0–20.7) 9.5 (8.3–11.0, 5.8–14.2) 4.75 (3.4–6.0, 1.5–11.2) <0.001
Age (years) at final EPRb: Median (IQRa, range)   2.0 (0.6–4.2, 0.0–14.0) 1.2 (0.4–2.5, 0.0–13.0) 2.0 (0.4–3.8, 0.0–13.0) 5.2 (2.3–9.1, 0.0–18.2) 6.9 (3.4–10.6, 0.2–17.9) 5.3 (2.0–10.3, 0.0–17.0) <0.001
Time in study (years): Median (IQRa, range)   0.2 (0.0–1.2, 0.0–4.0) 0.2 (0.0–0.9, 0.0–3.2) 0.2 (0.0–1.2, 0.0–4.3) 1.0 (0.0–2.4, 0.0–4.6) 1.0 (0.0–2.5, 0.0–5.0) 0.8 (0.0–2.2, 0.0–4.6) <0.001
  1. aIQR interquartile range
  2. b EPR electronic patient record