Table 1 Patient demographics and pathological characteristics.
Variables | All patients N (%) | Validation set N (%) | Training set N (%) | P value |
|---|---|---|---|---|
Year at diagnosis | Ā | Ā | Ā | 0.479 |
Ā 2004ā2007 | 984 (33.88) | 292 (33.49) | 692 (34.06) | Ā |
Ā 2008ā2011 | 954 (32.85) | 300 (34.40) | 654 (32.19) | Ā |
Ā 2012ā2015 | 966 (33.26) | 280 (32.11) | 686 (33.76) | Ā |
Ā Insured status | Ā | Ā | Ā | 0.736 |
Ā Uninsured/unknown | 903 (31.10) | 275 (31.54) | 628 (30.91) | Ā |
Ā Any medicaid/insured | 2001 (68.90) | 597 (68.46) | 1404 (69.09) | Ā |
Age | Ā | Ā | Ā | 0.528 |
Ā Ė65 | 1516 (52.20) | 463 (53.10) | 1053 (51.82) | Ā |
Ā ā„ā65 | 1388 (47.80) | 409 (46.90) | 979 (48.18) | Ā |
Marital status | Ā | Ā | Ā | 0.924 |
Ā Unmarried | 1336 (46.01) | 400 (45.87) | 936 (46.06) | Ā |
Ā Married | 1568 (53.99) | 472 (54.13) | 1096 (53.94) | Ā |
Gender | Ā | Ā | Ā | 0.373 |
Ā Female | 1432 (49.31) | 441 (50.57) | 991 (48.77) | Ā |
Ā Male | 1472 (50.69) | 431 (49.43) | 1041 (51.23) | Ā |
Race | Ā | Ā | Ā | 0.327 |
Ā Black | 275 (9.47) | 79 (9.06) | 196 (9.65) | Ā |
Ā White | 2370 (81.61) | 705 (80.85) | 1665 (81.94) | Ā |
Ā Other | 259 (8.92) | 88 (10.09) | 171 (8.42) | Ā |
Primary site | Ā | Ā | Ā | 0.510 |
Ā Cecumātransverse colon | 1799 (61.95) | 527 (60.44) | 1272 (62.60) | Ā |
Ā Descending colonāsigmoid | 461 (15.87) | 145 (16.63) | 316 (15.55) | Ā |
Ā Multiple | 43 (1.48) | 10 (1.15) | 33 (1.62) | Ā |
Ā Rectum | 564 (19.42) | 176 (20.18) | 388 (19.09) | Ā |
Ā Unknown | 37 (1.27) | 14 (1.61) | 23 (1.13) | Ā |
Grade | Ā | Ā | Ā | 0.155 |
Ā Grade I/II | 173 (5.96) | 63 (7.22) | 110 (5.41) | Ā |
Ā Grade III/IV | 2342 (80.65) | 697 (79.93) | 1645 (80.95) | Ā |
Ā Unknown | 389 (13.40) | 112 (12.84) | 277 (13.63) | Ā |
Tumor size | Ā | Ā | Ā | 0.882 |
Ā ā¤ā5Ā cm | 1179 (40.60) | 360 (41.28) | 819 (40.31) | Ā |
Ā Ė5Ā cm | 1244 (42.84) | 370 (42.43) | 874 (43.01) | Ā |
Ā Unknown | 481 (16.56) | 142 (16.28) | 339 (16.68) | Ā |
T stage | Ā | Ā | Ā | 0.079 |
Ā T0-Tis | 16 (0.55) | 4 (0.46) | 12 (0.59) | Ā |
Ā T1 | 167 (5.75) | 61 (7.00) | 106 (5.22) | Ā |
Ā T2 | 100 (3.44) | 35 (4.01) | 65 (3.20) | Ā |
Ā T3 | 1290 (44.42) | 401 (45.99) | 889 (43.75) | Ā |
Ā T4 | 1331 (45.83) | 371 (42.55) | 960 (47.24) | Ā |
N stage | Ā | Ā | Ā | 0.269 |
Ā N0 | 854 (29.41) | 274 (31.42) | 580 (28.54) | Ā |
Ā N1 | 690 (23.76) | 197 (22.59) | 493 (24.26) | Ā |
Ā N2 | 1360 (46.83) | 401 (45.99) | 959 (47.19) | Ā |
M stage | Ā | Ā | Ā | 0.713 |
Ā M0 | 1827 (62.91) | 553 (63.42) | 1274 (62.70) | Ā |
Ā M1 | 1077 (37.09) | 319 (36.58) | 758 (37.30) | Ā |
Surgery | Ā | Ā | Ā | 0.841 |
Ā No surgery | 336 (11.57) | 104 (11.93) | 232 (11.42) | Ā |
Ā Local tumor excision/partial colectomy | 840 (28.93) | 256 (29.36) | 584 (28.74) | Ā |
Ā Total colectomy | 1728 (59.50) | 512 (58.72) | 1216 (59.84) | Ā |
Lymph node dissection | Ā | Ā | Ā | 0.717 |
Ā None or biopsy | 507 (17.46) | 148 (16.97) | 359 (17.67) | Ā |
Ā 1 to 3 | 82 (2.82) | 22 (2.52) | 60 (2.95) | Ā |
Ā ā„ā4 | 2315 (79.72) | 702 (80.50) | 1613 (79.38) | Ā |
Chemotherapy | Ā | Ā | Ā | 0.418 |
Ā No/unknown | 1216 (41.87) | 375 (43.00) | 841 (41.39) | Ā |
Ā Yes | 1688 (58.13) | 497 (57.00) | 1191 (58.61) | Ā |
Radiotherapy | Ā | Ā | Ā | 0.751 |
Ā No/unknown | 2502 (86.16) | 754 (86.47) | 1748 (86.02) | Ā |
Ā Yes | 402 (13.84) | 118 (13.53) | 284 (13.98) | Ā |
