Table 2 Operative data and pathological results of patients
Characteristics | NSA group | SA group | P-value |
|---|---|---|---|
n = 218 | n = 232 | ||
Duration of operation | 0.672 | ||
Mean (SD), min | 229.3 (46.4) | 242.1 (37.8) | |
Estimated blood loss | 0.374 | ||
Mean (SD), ml | 248.3 (215.8) | 267.6 (189.2) | |
Intraoperative blood transfusion | 35 (16.1) | 41 (17.7) | 0.647 |
Extent of resection | 0.117 | ||
Distal subtotal | 137 (62.8) | 162 (69.8) | |
Total | 81 (37.2) | 70 (30.2) | |
Margin of resection | 0.014 | ||
R0 | 208 (95.4) | 207 (89.2) | |
R1 or R2 | 10 (4.6) | 25 (10.8) | |
LNs resected | 0.805 | ||
Mean (SD) | 31 (10) | 33 (15) | |
Excised tumor size (cm) | 0.038 | ||
Mean (SD) | 3.9 (1.7) | 5.3 (2.1) | |
Lymphovascular invasion | 59 (27.1) | 75 (32.3) | 0.222 |
Pathological T stage | < 0.001 | ||
T0 | 18 (8.3) | 0 (0.0) | |
T1 | 24 (11.0) | 12 (5.2) | |
T2 | 34 (15.6) | 18 (7.8) | |
T3 | 101 (46.3) | 114 (49.1) | |
T4a | 28 (12.8) | 45 (19.4) | |
T4b | 13 (6.0) | 43 (18.5) | |
Pathological N stage | < 0.001 | ||
N0 | 127 (58.3) | 70 (30.2) | |
N1 | 41 (18.8) | 62 (26.7) | |
N2 | 30 (13.8) | 50 (21.6) | |
N3a | 16 (7.3) | 31 (13.4) | |
N3b | 4 (1.8) | 19 (8.2) | |
Distant metastasis | < 0.001 | ||
M0 | 212 (97.2) | 203 (87.5) | |
M1 | 6 (2.8) | 29 (12.5) | |
Pathological TNM stage | < 0.001 | ||
0 | 18 (8.3) | 0 (0.0) | |
I | 36 (16.5) | 22 (9.5) | |
II | 80 (36.7) | 49 (21.1) | |
III | 78 (35.8) | 132 (56.9) | |
IV | 6 (2.8) | 29 (12.5) |