Table 1.
Characteristics | No. of lymph nodes examined (%) | p-value | |
---|---|---|---|
<12 (n = 21,497) | ≥12 (n = 58,799) | ||
Race | 0.013 | ||
White | 17,340 (80.7) | 47,882 (81.4) | |
Black | 2,547 (11.8) | 6,536 (11.1) | |
Other | 1,610 (7.5) | 4381 (7.5) | |
Age at diagnosis | <0.001 | ||
≤75 years | 11,660 (54.2) | 36,608 (62.3) | |
>75 years | 9,837 (45.8) | 22,191 (37.7) | |
T stage | 0.034 | ||
T3 | 17,951 (83.5) | 49,464 (84.1) | |
T4 | 3,546 (16.5) | 9,335 (15.9) | |
N stage | <0.001 | ||
N0 | 12,789 (59.5) | 31,748 (54.0) | |
N1 | 6,374 (29.7) | 16,079 (27.3) | |
N2 | 2,334 (10.9) | 10,972 (18.7) | |
Tumor grade | <0.001 | ||
High/Moderate | 16,700 (77.7) | 43,430 (73.9) | |
Poor/Anaplastic | 4,328 (20.1) | 14,318 (24.4) | |
Unknown | 469 (2.2) | 1,051 (1.8) | |
Sex | <0.001 | ||
Male | 10,575 (49.2) | 27,962 (47.6) | |
Female | 10,922 (50.8) | 30,837 (52.4) | |
Histology | <0.001 | ||
Adenocarcinoma | 19,287 (89.7) | 51,692 (87.9) | |
Mucinous/signet ring cell | 2,210 (10.3) | 7,107 (12.1) | |
Year of diagnosis | <0.001 | ||
2004–2007 | 15,878 (73.9) | 30,885 (52.5) | |
2008–2010 | 5,619 (26.1) | 27,914 (47.5) | |
Chemotherapy | <0.001 | ||
No | 15,267 (71.0) | 38,086 (64.8) | |
Yes | 6,230 (29.0) | 20,713 (35.2) |