TABLE 2.

Tumor and sentinel node characteristics

	CLND (90)	Active surveillance (145)	P value
Tumor characteristics
Breslow depth
Mean (IQR)	3.46 (1.5–4.3)	3.32 (1.5–3.9)	.736
Primary site, n (%)			.002
Upper extremity	15 (17%)	26 (18%)
Lower extremity	12 (13%)	43 (30%)
Trunk	37 (41%)	58 (40%)
Head and neck	26 (29%)	18 (12%)
Ulceration, n (%)
Present	33 (37%)	55 (38%)	.890
Sentinel node characteristics
Number of positive sentinel lymph nodes, n (%)			.081
1 node	55 (61%)	107 (74%)
2 nodes	25 (28%)	30 (21%)
3 nodes	5 (6%)	6 (4%)
>3 nodes	5 (6%)	2 (1%)
Diameter of largest sentinel lymph node metastasis (mm), n (%)			<.001
<0.1 mm	3 (3%)	28 (19%)
0.1–1 mm	37 (41%)	65 (45%)
>1 mm	50 (56%)	52 (36%)
Mean (IQR)	3.49 (0.4–5.0)	2.03 (0.1–2.0)	.011

Abbreviations: CLND, completion lymph node dissection; IQR, interquartile range.