Table 2.

Number of persons with at least one synchronous melanoma and by number of metachronous melanomas by behavior of index melanoma

		In situ		Invasive		Total
		N	%	N	%	N	%
Number of additional melanomas
	0	199	76.0	663	80.8	862	79.6
Synchronous melanomas only
		2	0.8	11	1.3	13	1.2
Metachronous melanomas
	1	33	12.6	93	11.3	126	11.6
	2	14	5.3	28	3.4	42	3.9
	3	8	3.1	13	1.6	21	1.9
	4	3	1.1	7	0.9	10	0.9
	5	2	0.8	6	0.7	8	0.7
	≥6	1	0.4	0	0.0	1	0.1
Total		262		821		1083