Table 3.
Patient Characteristics in Cases of Malignant Tumors That Were Clinically Diagnosed as Seborrheic Keratosis (Case, %)
| Characteristics | Overall Misdiagnosis | P valuea | Malignant Tumor | P valuea | BCC | P valuea | SCC | P valuea | MM | P valuea | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Number | 1089 | 238 (21.9) | 62 (5.7) | 31 (2.8) | 26 (2.4) | 5 (0.5) | |||||
| Sex | 0.020 | 0.063 | 0.457 | 0.269 | 0.068 | ||||||
| Male | 493 | 92 (18.7) | 21 (4.3) | 12 (2.4) | 9 (1.8) | 0 (0.0) | |||||
| Female | 596 | 146 (24.5) | 41 (6.9) | 19 (3.2) | 17 (2.9) | 5 (0.8) | |||||
| Age group | 0.128 | 0.037 | 0.689 | 0.007 | 1.000 | ||||||
| ≤20 years | 4 | 2 (50.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | |||||
| 21–40 years | 93 | 24 (25.8) | 2 (2.2) | 1 (1.1) | 1 (1.1) | 0 (0.0) | |||||
| 41–60 years | 430 | 82 (19.1) | 17 (4.0) | 12 (2.8) | 3 (0.7) | 2 (0.5) | |||||
| >60 years | 562 | 130 (23.1) | 43 (7.7) | 18 (3.2) | 22 (3.9) | 3 (0.5) | |||||
| Location | < 0.001 | < 0.001 | 0.009 | 0.249 | 0.216 | ||||||
| Scalp and neck | 132 | 14 (10.6) | 6 (4.5) | 3 (2.3) | 3 (2.3) | 0 (0.0) | |||||
| Face | 433 | 132 (30.5) | 41 (9.5) | 22 (5.1) | 16 (3.7) | 3 (0.7) | |||||
| Trunk | 330 | 44 (13.3) | 7 (2.1) | 3 (0.9) | 4 (1.2) | 0 (0.0) | |||||
| Buttocks and perineum | 61 | 13 (21.3) | 2 (3.3) | 1 (1.6) | 1 (1.6) | 0 (0.0) | |||||
| Limbs | 133 | 35 (26.3) | 6 (4.5) | 2 (1.5) | 2 (1.5) | 2 (1.5) |
Note: aComparison of the incidence.
Abbreviations: BCC, basal cell carcinoma; SCC, squamous cell carcinoma; MM, malignant melanoma.