Table 1. Characteristics of melanoma patients in the Netherlands, 1994–2008.

	Original data		Multiple imputation
Characteristic	N	%	%
Sex
Male	17 305	42.3	42.3
Female	23 575	57.7	57.7
Age
⩽40 years	9378	23.0	23.0
41–54 years	11 506	28.1	28.1
55–64 years	8217	20.1	20.1
⩾65 years	11 779	28.8	28.8
Location
Head and neck	5612	13.7	13.7
Trunk	14 693	35.9	35.9
Upper extremities	8163	20.0	20.0
Lower extremities	12 246	30.0	30.0
Other	166	0.4	0.4
Year
1994–1996	5907	14.5	14.5
1997–1999	6720	16.4	16.4
2000–2002	7779	19.0	19.0
2003–2005	9451	23.1	23.1
2006–2008	11 023	27.0	27.0
Breslow category
⩽1.0 mm	19 325	47.3	48.7
1.0–2.0 mm	8622	21.1	22.7
2.0–4.0 mm	5598	13.7	16.7
>4.0 mm	3451	8.4	11.9
Unknown	3884	9.5