| Nonbleeding group (n = 417) | Delayed bleeding group (n = 27) | χ2 or t value | P value |
---|---|---|---|---|
Procedure duration (min, mean ± SD) | 87.09 ± 72.40 | 79.70 ± 49.44 | 0.260 | 0.260 |
Procedure duration [n (%)] |  |  |  < 0.001 | 0.994 |
 ≤ 60 min | 185 (44.4) | 12 (44.4) |  |  |
 > 60 min | 232 (55.6) | 15 (55.6) |  |  |
Tumor size [n (%)] | Â | Â | 5.790 | 0.016* |
 ≤ 20 mm | 293 (70.3) | 13 (48.1) |  |  |
 > 20 mm | 124 (29.7) | 14 (51.9) |  |  |
Tumor location [n (%)] | Â | Â | NA | 0.129 |
 Upper | 127 (30.5) | 4 (14.8) |  |  |
 Medial | 27 (6.5) | 3 (11.1) |  |  |
 Lower | 263 (63.1) | 20 (74.1) |  |  |
Number of resected specimen [n (%)] | NA | 0.196 | ||
 Single | 374 (89.7) | 22 (81.5) |  |  |
 Multiple | 43 (10.3) | 5 (18.5) |  |  |
Lifting sign [n (%)] | Â | Â | 0.012 | 0.914 |
 Positive | 328 (78.7) | 21 (77.8) |  |  |
 Poor | 89 (21.3) | 6 (22.2) |  |  |
Intraoperative use of hemoclips [n (%)] | 5.209 | 0.022* | ||
 No | 265 (63.5) | 23 (85.2) |  |  |
 Yes | 152 (36.5) | 4 (14.8) |  |  |
Resection type [n (%)] | Â | Â | NA | 0.643 |
 Piecemeal | 21 (5.0) | 2 (7.4) |  |  |
 En bloc | 396 (95.0) | 25 (92.6) |  |  |
Procedure time [n (%)] | Â | Â | 0.652 | 0.419 |
 Morning | 234 (56.1) | 13 (48.1) |  |  |
 Afternoon | 183 (43.9) | 14 (51.9) |  |  |
Macroscopic type [n (%)] | Â | Â | NA | 1.000 |
 Type 0-I | 19 (4.6) | 1 (3.7) |  |  |
 Type 0-II | 396 (95.0) | 26 (96.3) |  |  |
 Type 0-III | 2 (0.5) | 0 (0.0) |  |  |
Tumor differentiation [n (%)] | Â | Â | NA | 0.721 |
 Differentiated | 381 (91.4) | 24 (88.9) |  |  |
 Undifferentiated | 36 (8.6) | 3 (11.1) |  |  |
Histological classification [n (%)] | Â | NA | 0.676 | |
 LGIN | 6 (1.4) | 0 (0.0) |  |  |
 HGIN | 45 (10.8) | 4 (14.8) |  |  |
 Gastric cancer | 366 (87.8) | 23 (85.2) |  |  |
Depth of tumor invasion [n (%)] | Â | NA | 0.896 | |
 M | 367 (88.0) | 24 (88.9) |  |  |
 SM1 | 34 (8.2) | 3 (11.1) |  |  |
 SM2 | 16 (3.8) | 0 (0.0) |  |  |
Vertical margin [n (%)] | Â | Â | NA | 0.300 |
 Negative | 401 (96.2) | 25 (92.6) |  |  |
 Positive | 16 (3.8) | 2 (7.4) |  |  |
Horizontal margin [n (%)] | Â | Â | NA | 0.077 |
 Negative | 403 (96.6) | 24 (88.9) |  |  |
 Positive | 14 (3.4) | 3 (11.1) |  |  |
Lymphatic invasion [n (%)] | Â | Â | NA | 0.324 |
 No | 400 (95.9) | 25 (92.6) |  |  |
 Yes | 17 (4.1) | 2 (7.4) |  |  |
Venous invasion [n (%)] |  |  |  < 0.001 | 1.000 |
 No | 399 (95.7) | 26 (96.3) |  |  |
 Yes | 18 (4.3) | 1 (3.7) |  |  |
Complete resection [n (%)] | Â | Â | NA | 0.204 |
 No | 23 (5.5) | 3 (11.1) |  |  |
 Yes | 394 (94.5) | 24 (88.9) |  |  |
Resection classification [n (%)] | Â | NA | 0.120 | |
 Curative resection | 243 (58.3) | 11 (40.7) |  |  |
 Curative resection for expanded indications | 90 (21.6) | 10 (37.0) |  |  |
 Noncurative resection | 84 (20.1) | 6 (22.2) |  |  |
Multiple tumors [n (%)] | Â | Â | NA | 0.036* |
 No | 390 (93.5) | 22 (81.5) |  |  |
 Yes | 27 (6.5) | 5 (18.5) |  |  |
Absolute indication [n (%)] | Â | Â | 3.137 | 0.077 |
 Yes | 257 (61.6) | 12 (44.4) |  |  |
 No | 160 (38.4) | 15 (55.6) |  |  |