Table 3 Descriptive and univariable logistic regression results for non-breed-related demographic risk factors evaluated for hypothyroidism during 2016 in dogs under primary veterinary care in the VetCompass Programme in the UK

Adult (> 18 months) bodyweight (kg)

 < 10.0

183 (0.09)

213,169 (99.91)

Base

 < 0.001

10.0—< 15.0

259 (0.26)

98,129 (99.74)

3.07

2.54–3.72

 < 0.001

15.0—< 20.0

207 (0.30)

69,184 (99.70)

3.49

2.86–4.25

 < 0.001

20.0—< 25.0

211 (0.33)

63,696 (99.67)

3.86

3.17–4.70

 < 0.001

25.0—< 30.0

246 (0.46)

53,528 (99.54)

5.35

4.42–6.48

 < 0.001

30.0—< 40.0

436 (0.62)

69,496 (99.38)

7.31

6.15–8.69

 < 0.001

 ≥ 40.0

246 (0.94)

26,011 (99.06)

11.02

9.09–13.35

 < 0.001

Uncategorised

317 (0.10)

310,225 (99.90)

1.19

0.99–1.43

0.061

Bodyweight relative to breed mean

Lower

557 (0.18)

316,792 (99.82)

Base

 < 0.001

Equal/Higher

1,225 (0.44)

274,288 (99.56)

2.54

2.30–2.81

 < 0.001

Uncategorised

323 (0.10)

312,358 (99.90)

0.59

0.51–0.67

 < 0.001

Age (years)

 < 3.0

9 (0.00)

329,266 (100.00)

0.01

0.01–0.03

 < 0.001

3.0—< 5.0

82 (0.05)

156,651 (99.95)

0.29

0.22–0.37

 < 0.001

5.0—< 7.0

231 (0.18)

126,239 (99.82)

Base

 < 0.001

7.0—< 9.0

419 (0.41)

101,832 (99.59)

2.25

1.91–2.64

 < 0.001

9.0—< 11.0

519 (0.66)

78,466 (99.34)

3.61

3.09–4.22

 < 0.001

11.0—< 13.0

457 (0.85)

53,158 (99.15)

4.70

4.01–5.51

 < 0.001

 ≥ 13.0

371 (0.81)

45,419 (99.19)

4.46

3.79–5.26

0.058

Uncategorised

17 (0.14)

12,407 (99.86)

0.75

0.46–1.23

0.250

Sex-Neuter

Female entire

261 (0.11)

233,566 (99.89)

Base

 < 0.001

Female neuter

795 (0.40)

197,086 (99.60)

3.61

3.14–4.15

 < 0.001

Male entire

370 (0.14)

259,152 (99.86)

1.28

1.09–1.50

0.002

Male neuter

673 (0.32)

209,411 (99.68)

2.88

2.49–3.32

 < 0.001

Uncategorised

6 (0.14)

4,223 (99.86)

1.27

0.57–2.86

0.561

Insurance

Non-insured

1,443 (0.18)

786,532 (99.82)

Base

 < 0.001

Insured

662 (0.56)

116,906 (99.44)

3.09

2.81–3.39

 < 0.001