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2: Number and percentage of patients failing to identify melanoma in each age group by sex, site, histology and thickness

<50 years
50 years
Total
No. not
identified
% (95% CI)
Total
No. not
identified
% (95% CI)
Sex: Male
469
141
30% (26%-34%)
675
277
41% (37%-47%)
Sex: Female
543
146
27% (23%-31%)
467
157
34% (29%-38%)
Chi-squared=1.25; df=1; P=0.264
Chi-squared=6.4; df=1; P=0.011
Site: Scalp
9
5
56% (23%-88%)
24
9
38% (18%-57%)
Site: Face
45
16
36% (22%-50%)
160
48
30% (23%-37%)
Site: Neck
42
12
29% (15%-42%)
47
19
40% (26%-54%)
Site: Back
367
133
36% (31%-41%)
420
191
45% (41%-50%)
Site: Arm
151
35
23% (16%-30%)
171
63
37% (30%-44%)
Site: Anterior trunk
93
20
22% (13%-30%)
65
18
28% (17%-39%)
Site: Leg
309
66
22% (17%-26%)
255
86
34% (28%-40%)
Chi-squared=26.6; df=6; P=0.001
Chi-squared=19.4; df=6; P=0.003
Histological type: SSM
855
245
29% (27%-32%)
747
289
39% (35%-42%)
Histological type: NM
148
39
26% (19%-23%)
247
74
30% (24%-36%)
Histological type: LM
9
3
33% (3%-64%)
148
71
48% (40%-56%)
Thickness < 3mm
966
276
29% (26%-31%)
976
390
40% (37%-43%)
Thickness 3mm
46
11
24% (18%-30%)
166
44
27% (20%-33%)
Chi-squared=0.47; df=1; P=0.493
Chi-squared=10.9; df=1; P=0.001

P values are from comparisons within each age group.
SSM=superficial spreading melanoma; NM=nodular melanoma; LM=lentigo maligna.

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