TABLE 1.
Demographic and clinical characteristics of study sample
| Patient characteristics | All patients (N = 11,594), No. (%) | Training patients (N = 7652), No. (%) | Testing patients (N = 3942), No. (%) |
|---|---|---|---|
| Demographics | |||
| Agea | |||
| Age, mean (SD), year | 57.3 (14.9) | 57.4 (14.9) | 57.2 (15.0) |
| Age, median (IQR), year | 58 (48–68) | 59 (47–68) | 58 (48–68) |
| Sex | |||
| Female | 5375 (46%) | 3566 (47%) | 1809 (46%) |
| Male | 6219 (54%) | 4086 (53%) | 2133 (54%) |
| Year of diagnosis | |||
| 2010 | 5565 (48%) | 3681 (48%) | 1884 (48%) |
| 2011 | 6029 (52%) | 3971 (52%) | 2058 (52%) |
| Clinical factors | |||
| AJCC 7th Edition stage | |||
| IA | 8216 (71%) | 5430 (71%) | 2786 (71%) |
| IB | 3350 (29%) | 2201 (29%) | 1149 (29%) |
| INOS | 28 (0%) | 21 (0%) | 7 (0%) |
| Breslow thickness | |||
| Breslow thickness, mean (SD) | 0.49 (0.24) | 0.49 (0.24) | 0.49 (0.25) |
| Breslow thickness, median (IQR) | 0.45 (0.30–0.65) | 0.45 (0.30–0.65) | 0.45 (0.30–0.65) |
| Ulceration | |||
| Ulceration not identified/not present | 11,177 (96%) | 7382 (96%) | 3795 (96%) |
| Ulceration present | 417 (4%) | 270 (4%) | 147 (4%) |
| Mitogenicity | |||
| Nonmitogenic | 8423 (73%) | 5564 (73%) | 2859 (73%) |
| Mitogenic | 3171 (27%) | 2088 (27%) | 1083 (27%) |
| Extension/Clark level | |||
| Clark level II | 5231 (45%) | 3458 (45%) | 1773 (45%) |
| Other | 6363 (55%) | 4194 (55%) | 2169 (55%) |
| Vital status at 7 years | |||
| Alive | 11,302 (97.5%) | 7475 (97.7%) | 3827 (97.1%) |
| Died (attributable to this cancer) | 292 (2.5%) | 177 (2.3%) | 115 (2.9%) |
Abbreviations: AJCC, American Joint Committee on Cancer; IQR, interquartile range; SD, standard deviation.
a
Age greater than 85 years reported as 85 years.