Table 2.
Surgical Outcomes Before Propensity Score Matching and After Propensity Score Matching
| Before PSM | After PSM | |||||
|---|---|---|---|---|---|---|
| Variables | LLR (n = 35) | OLR (n = 80) | P | LLR (n = 33) | OLR (n = 33) | P |
| Operative time (min) | 225 (80–505) | 210 (105–340) | .123 | 225 (80–505) | 210 (120–205) | .432 |
| Blood loss (mL) | 200 (20–1500) | 300 (50–1200) | .004 | 200 (20–1500) | 300 (50–1000) | .064 |
| Blood transfusion | 1 (2.9%) | 8 (10.0%) | .350 | 1 (3.0%) | 4 (12.1%) | .375 |
| Conversion | 1 (2.9%) | — | — | 1 (3.0%) | — | — |
| Resection extent | .376 | 1.000 | ||||
| major | 18 (51.4%) | 34 (42.5%) | 17 (51.5%) | 16 (48.5%) | ||
| minor | 17 (48.6%) | 46 (57.5%) | 16 (48.5%) | 17 (51.5%) | ||
| R0 resection | 35 (100.0%) | 79 (98.8%) | 1.000 | 33 (100.0%) | 33 (100.0%) | 1.000 |
| Satellites present | 6 (17.1%) | 15 (18.8%) | .837 | 5 (15.2%) | 4 (12.1%) | 1.000 |
| Microvascular invasion | 11 (31.4%) | 21 (26.3%) | .569 | 10 (30.3%) | 10 (30.3%) | 1.000 |
| Capsular invasion | 10 (28.6%) | 23 (28.8%) | .984 | 9 (27.3%) | 12 (36.4%) | .607 |
| Poor differentiation | 18 (51.4%) | 31 (38.8%) | .206 | 17 (51.5%) | 17 (51.5%) | 1.000 |
LLR, laparoscopic liver resection; OLR, open liver resection; PSM, propensity score matching.