. Author manuscript; available in PMC: 2019 Apr 22.

Published in final edited form as: Pediatr Dermatol. 2018 Mar 23;35(3):354–360. doi: 10.1111/pde.13454

TABLE 3.

Comparison of histopathologic features in childhood and adolescent melanomas

Histopathologic features	Childhood melanomas	Adolescent melanomas	P-value
Breslow thickness, mm, median (range)	3.5 (0.9–85)	1.5 (0.5–36)	.20^a
Mitotic index, figures/mm², median (range)	5 (1–15)	2 (0–10)	.07^a
Ulceration, n/N with reported features (%)	3/9 (33.3)	3/12 (25)	>.99^b
Lymphovascular invasion, n/N with reported features (%)	1/8 (12.5)	1/9 (11.1)	>.99^b
Neural invasion, n/N with reported features (%)	2/6 (33.3)	0/9 (0)	.14^b

Results reported for all melanomas for which Breslow thickness, mitotic index, ulceration, lymphovascular invasion, and neural invasion were reported.

Mann-Whitney U-test.

Fisher exact test.