| | characteristics | Sidedness (laterality) | P-value | | | Right sided cancer | Left sided cancer | | | N = 85,779 (%) | N = 78,201 (%) |
| | Age | | | | | Mean (SD) | 68.5 ± 12.7 | 63.0 ± 13.0 | <0.001 |
| | Age group (years) | | | | | <50 | 6,798 (7.9) | 11,546 (14.8) | <0.001 | | 50-69 | 35,523 (41.4) | 41,258 (52.8) | | 70-89 | 43,458 (50.7) | 25,397 (32.5) |
| | Gender | | | | | Male | 40,389 (47.1) | 43,410 (55.5) | <0.001 | | Female | 45,390 (52.9) | 34,791 (44.5) |
| | Race | | | | | Hispanic | 8,579 (10.0) | 9,325 (11.9) | <0.001 | | Black | 11,607 (13.5) | 9,182 (11.7) | | White | 59,370 (69.2) | 50,391 (64.4) | | Others | 6,223 (7.3) | 9,303 (11.9) |
| | Insurance | | | | | Insured | 57,449 (67.0) | 49,801 (63.7) | <0.001 | | Medicaid | 9,362 (10.9) | 10,553 (13.5) | | insured/no specifics | 14,922 (17.4) | 12,677 (16.2) | | uninsured | 2,470 (2.9) | 3,161 (4.0) | | unknown | 1,576 (1.8) | 2,009 (2.6) |
| | Marital status | | | | | Married | 44,909 (52.4) | 42,824 (54.8) | <0.001 | | Divorced | 7,971 (9.3) | 7,483 (9.6) | | Separated | 905 (1.1) | 1,048 (1.3) | | Single | 12,187 (14.2) | 13,303 (17.0) | | Unknown | 4,167 (4.9) | 4,385 (5.6) | | Widowed | 15,640 (18.2) | 9,158 (11.7) |
| | Geographic region | | | | | Northeastern | 13,587 (15.8) | 12,189 (15.6) | <0.001 | | Midwestern | 8,801 (10.3) | 6,789 (8.7) | | Western | 41,869 (48.8) | 40,144 (51.3) | | Southern | 21,522 (25.1) | 19,079 (24.4) |
| | Tumor Grade | | | | | Grade I | 6,560 (7.7) | 6,585 (8.4) | | | Grade II | 54,799 (63.4) | 54,616 (69.8) | | | Grade III | 16,540 (19.3) | 9,175 (11.7) | <0.001 | | Grade IV | 2,713 (3.2) | 1,292 (1.7) | | | Unknown | 5,167 (6.0) | 6,533 (8.4) | |
| | AJCC (6th Edition stages) | | | | | I | 19,321 (22.5) | 20,240 (25.9) | <0.001 | | II | 25,989 (30.3) | 18,744 (24.0) | | III | 23,914 (27.9) | 22,391 (28.6) | | IV | 16,555 (19.3) | 16,826 (21.5) |
| | Histology | | | | | Mucinous adenocarcinoma | 9,172 (10.7) | 3,923 (5.0) | | | Adenocarcinoma NOS | 59,460 (69.3) | 57,095 (73.0) | | | Signet ring cell carcinoma | 1,219 (1.4) | 523 (0.7) | <0.001 | | Adenocarcinoma in adenomatous polyps | 5,849 (6.8) | 8,117 (10.4) | | | Others (papillary, adenosquamous, medullary) | 10,079 (11.8) | 8,543 (10.9) | | | Treatment by surgery | | | | | Surgery performed | 79,083 (92.2) | 70,079 (89.6) | <0.001 | | No surgery (other reasons) | 6,696 (7.8) | 8,122 (10.4) |
| | T-staging | | | <0.001 | | T0 | 14(0.02) | 44 (0.06) | | | T1 | 11,707 (13.7) | 16,304 (20.8) | | T2 | 11,871 (13.8) | 9,311 (11.9) | | T3 | 44,314 (51.7) | 36,608 (46.8) | | | T4 | 14,490 (16.9) | 12,069 (15.4) | | Tx | 3,383 (3.9) | 3,865 (4.9) |
| | N staging | | | | | N0 | 49,302 (57.5) | 44,227 (56.6) | <0.001 | | N1 | 20,546 (24.0) | 20,155 (25.8) | | N2 | 14,311 (16.7) | 11,865 (15.2) | | Nx | 1,620 (1.9) | 1,954 (2.5) |
|
|
