Table 2 Risk factors for mast cell tumour (MCT) from univariable analysis

Age

≤2.0 years

8

840

1(base)

<0.001

2.0-4.0 years

22

301

7.7

3.4-17.4

<0.001

4.0-6.0 years

60

245

25.7

12.1-54.5

   0.038

6.0-8.0 years

82

199

43.3

20.-90.9

<0.001

8.0-10.0 years

95

171

58.3

27.8-122.3

<0.001

>10.0 years

108

267

42.5

20.4-88.2

<0.001

Age (continuous)

Median (IQR) (years)

8.2 (6.0 - 10.2)

3.1 (0.5 – 7.2

1.2

1.2-1.3

<0.001

Breed Type

Crossbred

65

391

1(base)

   0.016

Boxer

47

22

12.9

7.3-22.7

<0.001

Golden Retriever

43

39

6.6

4.0-11.0

<0.001

Weimaraner

6

9

4.0

1.4-11.6

   0.028

Labrador Retriever

106

215

3.0

2.1-4.2

<0.001

Pug

7

15

2.8

1.1-7.2

   0.096

Staffordshire Bull Terrier

72

159

2.7

1.9-4.0

<0.001

Springer Spaniel

8

50

1.0

0.4-2.1

   0.379

Jack Russell Terrier

18

155

0.7

0.4-1.2

   0.006

Border Collie

3

60

0.3

0.1-1.0

   0.005

Cocker Spaniel

4

86

0.3

0.1-0.8

   0.001

West Highland White Terrier

3

66

0.3

0.1-0.9

   0.002

Yorkshire Terrier

2

57

0.2

0.1-0.9

   0.003

German Shepherd Dog

1

63

0.1

0.0-0.7

<0.001

Other specific breed type

68

649

0.6

0.4-0.9

   0.456

Purebred status

Crossbred

65

391

1(base)

Of breed type

388

1654

1.4

1.1-1.9

   0.016

Insurance status

Not insured

162

1502

1(base)

Insured

291

527

5.1

4.1-6.4

<0.001

Neuter status

Entire

130

102

1(base)

Neutered

323

820

0.3

0.2-0.4

<0.001

Sex

Female

233

956

1(base)

Male

218

1067

1.2

1.0-1.5

   0.090

Weight

≤10.0 kg

49

771

1(base)

<0.001

10.0-20.0 kg

60

379

2.5

1.7-3.7

<0.001

20.0-30.0 kg

145

296

7.7

5.4-10.9

<0.001

30.0-40.0 kg

135

197

10.8

7.5-15.5

<0.001

>40.0 kg

46

79

9.2

5.8-14.6

<0.001

Weight (continuous) (kg)

Median (IQR)

27.7 (20.0 - 34.2)

11.6 (6.0 – 24.7)

1.1

1.1-1.1

<0.001