Epidemiological assessment of the risk of canine mast cell tumours based on the Kiupel two-grade malignancy classification

Table 3 Frequency of MCT grade by age, size and sex

Variable	All MCTs	Kiupel grade		Control group^b
Variable	All MCTs	Low	High	Control group^b
Age (years)
0–3	15	11	4	398
0–3	3.0%	2.9%	3.3%	17.5%
4–6	127	110	17	466
4–6	25.8%	29.4%	14.2%	20.5%
7–10	262	210	52	928
7–10	53.2%	56.3%	43.7%	40.8%
11–16	88	42	46	479
11–16	17.8%	11.2%	38.6%	21.0%
M ± SD	8.09 ± 2.72	7.64 ± 2.42	9.52 ± 3.10	7.44 ± 3.73
Size^a
Small	65	46	19	474
Small	19.0%	17.0%	26.7%	30.0%
Medium	207	172	35	510
Medium	60.7%	63.7%	49.3%	32.3%
Large	69	52	17	594
Large	20.2%	19.2%	23.9%	37.6%
Sex
Male	274	205	69	1444
Male	55.6%	54.9%	57.9%	63.5%
Female	218	168	50	827
Female	44.3%	45.0%	42.0%	36.4%
Total	492	373	119	2271

M mean, SD standard deviation
^aThe analysis did not take into account crossbreed dogs, whose size was not recognized
^bTotal number of dogs with other skin tumours of a given age, size and sex

ISSN: 1751-0147