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1: Thickness, histological type and site of melanoma by age and sex

Men (n=1144)
<50 years (n=469)
50 years (n=675)
No.
% (95% CI)
No.
% (95% CI)
Thickness < 3mm442
94% (92%-96%)
563
83% (81%-86%)
Thickness 3mm27
6% (4%-8%)
112
17% (14%-19%)
Site: Scalp6
1% (0.3%-2%)
19
3% (2%-4%)
Site: Face22
5% (3%-7%)
92
14% (11%-16%)
Site: Neck15
3% (2%-5%)
24
4% (2%-5%)
Site: Back216
46% (42%-51%)
327
48% (45%-52%)
Site: Arm52
11% (8%-14%)
80
12% (9%-14%)
Site: Anterior trunk60
13% (10%-16%)
53
8% (6%-10%)
Site: Leg98
21% (17%-25%)
80
12% (9%-14%)
Chi-squared=80; df=6; P=0.001
Histological type: SSM393
84% (80%-87%)
442
63% (59%-66%)
Histological type: NM73
16% (12%-19%)
169
25% (22%-28%)
Histological type: LM3
1% (0-1.4%)
84
12% (10%-15%)
Chi-squared=80; df=2; P=0.001
Histological type of melanomas 3mm
(n=27)
(n=112)
SSM7
26% (9%-42%)
22
20% (12%-27%)
NM20
74% (58%-91%)
85
76% (68%-84%)
LM--
--
5
4% (1%-8%)
Chi-squared=1.6; df=2; P=0.443

Women (n=1010)
<50 years (n=543)
50 years (n=467)
No.
% (95% CI)
No.
% (95% CI)
Thickness < 3mm524
97% (95%-99%)
413
88% (86%-91%)
Thickness 3mm19
4% (2%-6%)
54
12% (9%-14%)
Site: Scalp3
1% (0-1%)
5
1% (0.1%-2%)
Site: Face23
4% (3%-6%)
68
15% (11%-18%)
Site: Neck27
8% (3%-7%)
23
8% (3%-7%)
Site: Back151
28% (24%-32%)
93
20% (16%-24%)
Site: Arm99
18% (15%-22%)
91
19% (16%-23%)
Site: Anterior trunk33
6% (4%-8%)
12
3% (1%-4%)
Site: Leg207
38% (34%-42%)
175
37% (33%-42%)
Chi-squared=44.2; df=6; P=0.00
Histological type: SSM462
85% (82%-88%)
325
76% (65%-74%)
Histological type: NM75
14% (11%-17%)
78
17% (13%-20%)
Histological type: LM6
1% (0.2%-2%)
64
14% (11%-17%)
Chi-squared=66.6; df=2; P=0.001
Histological type of melanomas 3mm
(n=19)
(n=54)
SSM5
26% (7%-46%)
18
33% (21%-46%)
NM14
74% (54%-93%)
33
61% (48%-74%)
LM--
--
3
6% (0-12%)
Chi-squared=1.6; df=2; P=0.445

Differences were considered significant if confidence intervals did not overlap. P values are from comparisons between age groups.
SSM=superficial spreading melanoma; NM=nodular melanoma; LM=lentigo maligna.

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