Table 1.
Association between nevus number (high vs. low) and melanoma characteristics (p‐values based on χ 2 test, Wilcoxon–Mann–Whitney and t‐test)
| Low nevus count | High nevus count | Total | p‐Value | ||
|---|---|---|---|---|---|
| Countries | United Kingdom | 627 (60.1%) | 416 (39.9%) | 1,041 | <0.001a |
| Spain | 873 (76.5%) | 268 (23.5%) | 1,141 | ||
| Sex | Female | 814 (69.3%) | 361 (30.7%) | 1,175 | 0.566a |
| Male | 682 (68.1%) | 319 (31.9%) | 1,001 | ||
| Age (years) | Median | 57 (20–84) | 48.3 (20–76) | <0.001b | |
| Age categorical (years)` | <50 | 541 (59.4%) | 369 (40.5%) | 910 | <0.001a |
| ≥50 | 937 (75%) | 313 (25%) | 1,250 | ||
| Ulceration | No | 779 (69.4%) | 344 (30.6%) | 1,123 | 0.001a |
| Yes | 382 (77.2%) | 113 (22.8%) | 495 | ||
| Breslow thickness (mm) | 2.45 ± 0.06 | 1.86 ± 0.07 | <0.001c | ||
| Breslow thickness grouped using AJCC | T1 | 364 (62.7%) | 216 (37.2%) | 580 | <0.00a |
| T2 | 531 (65.1%) | 284 (34.8%) | 815 | ||
| T3 | 344 (75.1%) | 114 (24.9%) | 458 | ||
| T4 | 227 (79.6%) | 58 (20.3%) | 285 | ||
| Mitotic rate | <5 | 784 (68.5%) | 361 (31.5%) | 1,145 | 0.05a |
| ≥5 | 291 (76.7%) | 104 (26.3%) | 395 | ||
| Site of primary | Head and neck | 196 (77.8%) | 56 (22.2%) | 252 | <0.001a |
| Trunk | 528 (63.7%) | 300 (36.2%) | 828 | ||
| Limbs | 660 (69.2%) | 294 (30.8%) | 954 | ||
| SLN performed | No | 531 (59.3%) | 364 (40.7%) | 895 | <0.001a |
| Yes | 969 (75.2%) | 320 (24.8%) | 1,289 | ||
| SLN status | Negative | 745 (74.9%) | 249 (25.0%) | 994 | 0.732a |
| Positive | 224 (75.9%) | 71 (24.0%) | 295 |
a
p‐Value calculated using Pearson's χ 2 d test.
b
p‐Value calculated with Wilcoxon–Mann–Whitney test.
c
p‐Value calculated using t‐test.