Table 6.
Pathological features
| ESSQS group (n = 586) | Non‐ESSQS group (n = 842) | P † | |
|---|---|---|---|
| pT category | |||
| pT0 | 32 (5·5) | 49 (5·8) | 0·695 |
| pT1a | 7 (1·2) | 9 (1·1) | |
| pT1b | 140 (23·9) | 180 (21·4) | |
| pT2 | 95 (16·2) | 163 (19·4) | |
| pT3 | 269 (45·9) | 382 (45·4) | |
| pT4a | 35 (6·0) | 48 (5·7) | |
| pT4b | 8 (1·4) | 11 (1·3) | |
| pN category | |||
| pN0 | 427 (72·9) | 598 (71·0) | 0·491 |
| pN1 | 122 (20·8) | 199 (23·6) | |
| pN2 | 31 (5·3) | 40 (4·8) | |
| pN3 | 6 (1·0) | 5 (0·6) | |
| Pathological stage | |||
| 0 | 39 (6·7) | 49 (5·8) | 0·784 |
| I | 213 (36·3) | 300 (35·6) | |
| II | 179 (30·5) | 252 (29·9) | |
| III | 155 (26·5) | 241 (28·6) | |
| Tumour size (mm) * | 34·5 (32·8–36·2) | 34·4 (33·0–35·9) | 0·939‡ |
| No. of metastatic nodes * | 0·79 (0·61–0·98) | 0·73 (0·58–0·89) | 0·617‡ |
| Lymph vessel invasion | 299 (51·0) | 342 (40·6) | < 0·001 |
| Venous vessel invasion | 300 (51·2) | 350 (41·6) | < 0·001 |
| Differentiated adenocarcinoma | 553 (94·4) | 805 (95·6) | 0·287 |
| With undifferentiated features | 116 (20·0) | 121 (14·4) | 0·007 |
| Adjuvant chemotherapy | |||
| Stage II | 56 of 179 (31·3) | 36 of 252 (14·3) | < 0·001 |
| Stage III | 108 of 155 (69·7) | 173 of 241 (71·8) | 0·652 |
Values in parentheses are percentages unless indicated otherwise;
*
values are mean (95 per cent c.i.). ESSQS, Endoscopic Surgical Skill Qualification System.
†
χ2 test, except
‡
Student's t test.