Table 3.
Comparison of surgical outcomes between LNY ≥ 12 group and < 12 group.
| Variables | All (n=257) | Before matching | After matching | ||||
|---|---|---|---|---|---|---|---|
| LNY ≥ 12 | LNY < 12 | P value | LNY ≥ 12 | LNY < 12 | P value | ||
| (n=98) | (n=159) | (n=87) | (n=87) | ||||
| Period of operation | 0.356 | 0.165 | |||||
| 2010-2015 | 101 (39.3) | 35 (35.7) | 66 (41.5) | 31 (35.6) | 40 (46.0) | ||
| 2016-2018 | 156 (60.7) | 63 (64.3) | 93 (58.5) | 56 (64.4) | 47 (54.0) | ||
| Type of surgery | 0.421 | 0.459 | |||||
| LAR | 126 (49.0) | 48 (49.0) | 78 (49.1) | 42 (48.3) | 36 (41.4) | ||
| ELAPE | 108 (42.0) | 41 (41.8) | 67 (42.1) | 38 (43.7) | 46 (52.9) | ||
| APR | 19 (7.4) | 8 (8.2) | 11 (6.9) | 7 (8.0) | 5 (5.7) | ||
| Hartmann’s procedure | 4 (1.6) | 1 (1.0) | 3 (1.9) | 0 | 0 | ||
| Surgeons | 0.715 | 0.517 | |||||
| Senior | 223 (86.8) | 86 (87.8) | 137 (86.2) | 76 (87.4) | 73 (83.9) | ||
| Junior | 34 (13.2) | 12 (12.2) | 22 (13.8) | 11 (12.6) | 14 (16.1) | ||
| Operative time, median (IQR),min | 216 (180-260) | 219 (185-261) | 215 (180-260) | 0.952 | 215 (180-255) | 216 (180-258) | 0.680 |
| Blood loss, median (IQR),ml | 50 (30-100) | 50 (20-100) | 50 (30-100) | 0.167 | 50 (20-100) | 50 (30-100) | 0.092 |
| Conversion to open surgery, n (%) | 8 (3.1) | 4 (4.1) | 4 (2.5) | 0.485 | 3 (3.4) | 3 (3.4) | 1.000 |
| 30-d complications, n (%) | 29 (11.3) | 9 (9.2) | 20 (12.6) | 0.403 | 9 (10.3) | 12 (13.8) | 0.485 |
| Clavien-Dindo classification, n (%) | 0.693 | 0.744 | |||||
| I-II | 23 (8.9) | 7 (7.1) | 16 (10.1) | 7 (8.0) | 10 (11.5) | ||
| III-IV | 6 (2.3) | 2 (2.0) | 4 (2.5) | 2 (2.3) | 2 (2.3) | ||
| Reoperation, n (%) | 5 (1.9) | 1 (1.0) | 4 (2.5) | 0.652 | 1 (1.1) | 2 (2.3) | 1.000 |
| 30-d Mortality, n (%) | 1 (0.4) | 1 (1.0) | 0 | 0.381 | 1 (1.1) | 0 | 1.000 |
| Postoperative LOS, median (IQR), d | 7 (6-9) | 7 (6-9) | 7 (6-9) | 0.502 | 7 (6-9) | 8 (7-9) | 0.180 |
| Follow-up, median (IQR),m | 65 (54-75) | 67 (52-75) | 64 (55-74) | 0.778 | 67 (52-75) | 67 (54-72) | 0.929 |
| Recurrence*, n (%) | 60 (23.3) | 23 (23.5) | 37 (23.3) | 0.971 | 20 (23.0) | 23 (26.4) | 0.598 |
| Locoregional recurrence, n (%) | 10 (3.9) | 5 (5.1) | 5 (3.1) | 0.512 | 4 (4.6) | 5 (5.7) | 1.000 |
| Distant metastasis, n (%) | 54 (21.0) | 20 (20.4) | 34 (21.4) | 0.852 | 17 (19.5) | 18 (20.7) | 0.85 |
LNY, lymph node yield; LAR, low anterior resection; ELAPE, extralevator abdominoperineal excision; APR, abdominoperineal resection; LOS, length of stay.
*Four patients had both locoregional recurrence and distant metastasis.