Table 2 Descriptive and univariable logistic regression results for breed-derived risk factors for hypothyroidism during 2016 in dogs under primary veterinary care in the VetCompass Programme in the UK

Purebred status

Crossbred

332 (0.17)

194,337 (99.83)

Base

 < 0.001

Designer

32 (0.06)

52,654 (99.94)

0.36

0.25–0.51

 < 0.001

Purebred

1,734 (0.26)

653,168 (99.74)

1.55

1.38–1.75

 < 0.001

Kennel Club Recognised Breed

Not recognised

386 (0.15)

261,969 (99.85)

Base

 < 0.001

Recognised

1,712 (0.27)

638,190 (99.73)

1.82

1.63–2.03

 < 0.001

Kennel Club Breed Group

Not Kennel Club recognised breed

386 (0.15)

261,969 (99.85)

Base

 < 0.001

Terrier

248 (0.17)

145,673 (99.83)

1.16

0.96–1.36

0.076

Gundog

562 (0.41)

135,111 (99.59)

2.82

2.48–3.21

 < 0.001

Working

345 (0.88)

38,872 (99.12)

6.02

5.21–6.97

 < 0.001

Pastoral

173 (0.33)

52,809 (99.67)

2.22

1.86–2.66

 < 0.001

Utility

195 (0.19)

102,469 (99.81)

1.29

1.09–1.53

0.004

Hound

98 (0.31)

31,319 (99.69)

2.12

1.70–2.65

 < 0.001

Toy

91 (0.07)

131,937 (99.93)

0.47

0.37–0.59

 < 0.001

Skull conformation

Mesocephalic

1,196 (0.29)

416,448 (99.71)

Base

Brachycephalic

293 (0.17)

167,140 (99.83)

0.61

0.54–0.69

 < 0.001

Dolichocephalic

245 (0.35)

69,580 (99.65)

1.23

1.07–1.41

0.004

Uncategorised

371 (0.15)

250,270 (99.85)

0.52

0.46–0.58

 < 0.001