Table 1 Demographics of the patient population
Characteristic | SEER | FMUUH | P value | Overall |
|---|---|---|---|---|
Mean age, y (%) | 64.2 ± 13.7 | 58.9 ± 12.0 | < 0.001 | 62.4 ± 13.4 |
Gender, n (%) | ||||
 Male | 1024 (55.9) | 674 (73.3) | < 0.001 | 1698 (61.7) |
 Female | 809 (44.1) | 246 (26.7) | 1055 (38.3) | |
Ethnicity, n (%) | ||||
 White | 662 (36.1) | 0 | < 0.001 | 662 (24.0) |
 Asian | 555 (30.3) | 920 (100) | < 0.001 | 1475 (53.6) |
 Black | 251 (13.7) | 0 | < 0.001 | 251 (9.1) |
 Hispanic | 346 (18.9) | 0 | < 0.001 | 346 (12.6) |
 Native American | 19 (1.0) | 0 | < 0.001 | 19 (0.7) |
Histology, n (%) | ||||
 G1/G2 | 263 (14.3) | 184 (20.0) | < 0.001 | 447 (16.2) |
 G3/G4 | 1570 (85.7) | 736 (80.0) | 2306 (83.8) | |
Median tumor size, mm | 60 (2–220) | 70 (10–200) | 0.005 | 60 (2–220) |
T-category, n (%) | ||||
 T1 | 48 (2.6) | 9 (1.0) | 0.004 | 57 (2.1) |
 T2 | 83 (4.5) | 32 (3.5) | 0.194 | 115 (4.2) |
 T3 | 616 (33.6) | 115 (12.5) | < 0.001 | 731 (26.6) |
 T4a | 834 (45.5) | 549 (59.7) | < 0.001 | 1383 (50.2) |
 T4b | 252 (13.7) | 215 (23.4) | < 0.001 | 467 (17.0) |
N-category, n (%) | ||||
 N3a | 1093 (59.6) | 554 (60.2) | 0.766 | 1647 (59.8) |
 N3b | 740 (40.4) | 366 (39.8) | 1106 (40.2) | |
Stage, n (%) | ||||
 IIB | 39 (2.1) | 7 (0.8) | 0.008 | 46 (1.7) |
 IIIA | 59 (3.2) | 25 (2.7) | 0.471 | 84 (3.1) |
 IIIB | 892 (48.7) | 421 (45.8) | 0.150 | 1313 (47.7) |
 IIIC | 843 (46.0) | 467 (50.8) | 0.018 | 1310 (47.6) |
Type of surgery, n (%) | ||||
 Proximal/distal gastrectomy | 1274 (69.5) | 350 (38.0) | < 0.001 | 1624 |
 Total gastrectomy | 559 (30.5) | 570 (62.0) | 1129 | |
LNs examined, median | 24 (16–90) | 30 (16–80) | < 0.001 | 26 (16–90) |
 MLNs, median | 14 (7–90) | 14 (7–69) | 0.469 | 14 (7–90) |