Table 1 Patient characteristics in the study
Variable | Total (n = 4971) | Training Cohort (n = 3479) | Validation Cohort (n = 1492) | P |
|---|---|---|---|---|
Age, median (25th–75th percentile | 63(54–72) | 63(54–72) | 63(54–72) | 0.821 |
Sex n (%) | Â | Â | Â | 0.475 |
 Male | 2597 (52.2) | 1806 (51.9) | 791 (53.0) |  |
 Female | 2374 (47.7) | 1673 (48.1) | 701 (47.0) |  |
Race n (%) | Â | Â | Â | 0.832 |
 White | 3929 (79.0) | 2751 (79.2) | 1173 (78.6) |  |
 Black | 824 (16.6) | 574 (16.5) | 250 (16.7) |  |
 Other | 218 (4.4) | 149 (4.3) | 69 (4.6) |  |
Marital status n (%) | Â | Â | Â | 0.895 |
 Married | 3135 (63.1) | 2192 (63.0) | 943 (63.2) |  |
 Unmarried | 1836 (36.9) | 1287 (37.0) | 549 (36.8) |  |
Grade n (%) | Â | Â | Â | 0.143 |
 I | 2962 (59.6) | 2080 (59.8) | 882 (59.1) |  |
 II | 1412 (28.4) | 1000 (28.7) | 412 (27.6) |  |
 III | 565 (11.4) | 374 (10.7) | 191 (12.8) |  |
 IV | 32 (0.6) | 25 (0.7) | 7 (0.5) |  |
AJCC TNM stage n (%) | Â | Â | Â | 0.062 |
 I | 729 (14.7) | 541 (15.5) | 188 (12.6) |  |
 II | 1024 (20.6) | 707 (20.0) | 317 (21.2) |  |
 III | 2108 (42.4) | 1459 (41.9) | 649 (43.5) |  |
 IV | 1110 (22.3) | 772 (22.2) | 338 (22.6) |  |
Insurance Status | Â | Â | Â | 0.279 |
 Insured | 4320 (86.9) | 3038 (87.3) | 1282 (85.9) |  |
 Medicaid | 497 (10.0) | 341 (9.8) | 156 (10.4) |  |
 Uninsured | 154 (3.1) | 100 (2.9) | 54 (3.6) |  |
Surgery | Â | Â | Â | 0.199 |
 Yes | 4525 (91.0) | 3155 (90.7) | 1370 (91.8) |  |
 No | 446 (9.0) | 324 (9.3) | 122 (8.2) |  |
Radiation | Â | Â | Â | 0.628 |
 Yes | 111 (2.2) | 80 (2.3) | 31 (2.1) |  |
 No | 4860 (97.7) | 3399 (97.7) | 1461 (97.9) |  |
Chemotherapy | Â | Â | Â | 0.432 |
 Yes | 897 (18.0) | 618 (17.8) | 279 (18.7) |  |
 No | 4074 (81.9) | 2861 (82.2) | 1213 (81.2) |  |