Table 2.

Demographic and histological characteristics of the primary tumours with SLNB

Variable	All patients with SLNB	SLN-positive	SLN-negative	p value	OR
Total no.	78	9	69
Age mean (years)	48.526	46.33	48.812	0.614b
<35	18	4	14	0.136a
36–49	21	0	21
50–64	32	4	28
>65	7	1	6
Gender				0.492a	1.724 (0.426–6.985) c
Male	34	5	29
Female	44	4	40
Histological type
Superficial spreading	72
Nodular	4
Acral lentiginosus	2
Location				0.9312 a
Head and neck	4	0	4
Trunk ventral	11	2	9
Trunk dorsal	27	4	23
Upper extremities	14	1	13
Lower extremities	20	2	18
Acral	2	0	2
Thickness (mean)	0.716	0.714	0.717	0.966b
Ulceration				0.586 a	0c
Present	8	0	8
Absent	70	9	61
Mitotic rate (mean)	2.25	1.89	2.29	0.494 b
Clark level				0.715 a	1.5 (0.368–6.114) c
II	28	4	24
III	50	5	45
Regression				0.044 a	4 (0.916–17.459) c
Present	29	6	23
Absent	49	3	46
Reclassified stage (AJCC8th)				0.566 d
pT1a	37	4	33
pT1b	41	5e	36

^aFisher’s exact test

^bStudent t-test

^cOR (95% CI)

^dMann Whitney U

^eTwo patients had melanoma with Breslow 0.76 mm, less than 0.8 mm, but ordered into pT1b group

α = 0.05

p two-sided