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Table 1 Demographic information, distribution of variables potentially associated with prognosis and follow-up information of 64 dogs with stage I low grade mast cell tumor treated by surgical excision and prophylactic regional lymphadenectomy or nodal observation only. Differences in data distribution were assessed with Chi-square test/Fisher’s exact test (categorical variables) or Mann-Whitney U test (quantitative variables)

From: A retrospective study on prophylactic regional lymphadenectomy versus nodal observation only in the management of dogs with stage I, completely resected, low-grade cutaneous mast cell tumors

Variable Observation only (n = 35) Prophylactic regional lymphadenectomy
(n = 29)
P
Purebred    0.164
Yes 32 22  
No 3 7  
Breed    0.078
Boxer, French bulldog, Weimaraner, Pug, American Staffordishire terrier 13 5  
Other 22 24  
Age (years)    0.224
Median (range) 6.0 (2.0–11.0) 7.0 (1.0–13.0)  
Weight (kg)    0.237
Median (range) 33.0 (8.4–50.4) 27.4 (5.0–55.0)  
Sex    0.454
Male 17 11  
Female 18 18  
Neutering status    0.175
Yes 27 17  
No 8 12  
Anatomic location    0.137
Head and neck 8 8  
Trunk and limbs 25 15  
Inguinal/perineal/mammary/digital 2 6  
Tumor diameter (cm)    0.567
Median (range) 1.4 (0.5–5.4) 1.3 (0.3–9.0)  
Ulceration    > 0.999
Yes 2 2  
No 33 27  
Follow-up time (days)
Median (range)
813 (290–2900) 763 (181–2039) 0.267
Disease progression    0.028*
Yes 6 0  
No 29 29  
Development of new MCT    0.037*
Yes 12 3  
No 23 26  
MCT related death    0.245
Yes 3 0  
No 32 29