Table 1. Demographic data and preoperative variables before and after propensity score matching for colorectal liver metastases.
| Characteristics | OLR (N=101) | LLR (N=18) | P | PSM OLR (N=18) | PSM LLR (N=18) | P |
|---|---|---|---|---|---|---|
| Sex (Male:Female) | 64:37 | 5:13 | 0.004 | 7:11 | 5:13 | 0.480 |
| Age (year) [median, (IQR)] | 64.0 (58.0–69.0) | 68.0 (50.8–74.8) | 0.533 | 63.5 (59.0–67.5) | 68.0 (50.8–74.8) | 0.646 |
| BMI (kg/m2) [median, (IQR)] | 26.3 (22.6–28.4) | 24.5 (23.8–27.2) | 0.830 | 24.0 (22.3–26.4) | 24.5 (23.8–27.2) | 0.275 |
| >30 (kg/m2) [n, (%)] | 18 (17.8) | 1 (5.5) | 0.300 | 3 (16.7) | 1 (5.6) | 0.603 |
| <30 (kg/m2) [n, (%)] | 83 (82.2) | 17 (94.4) | 15 (83.3) | 17 (94.4) | ||
| ASA I/II [n, (%)] | 71 (70.3) | 15 (83.3) | 0.392 | 11 (61.1) | 15 (83.3) | 0.264 |
| ASA III/IV [n, (%)] | 30 (29.7) | 3 (16.7) | 0.392 | 7 (38.9) | 3 (16.7) | |
| Comorbidity [n, (%)] | 68 (67.3) | 7 (38.9) | 0.021 | 8 (44.4) | 7 (38.9) | 1 |
| Liver disease [n, (%)] | 0.011 | 0.229 | ||||
| Cirrhosis [n, (%)] | 0 | 0 | 0 | 0 | ||
| Steatosis [n, (%)] | 4 | 0 | 0 | 0 | ||
| Healthy [n, (%)] | 97 | 18 | 18 | 18 | ||
| CEA [median, (IQR)] | 1.6 (0.0–5.7) | 1.1 (0.0–3.5) | 0.764 | 0.0 (0.0–7.1) | 1.1 (0.0–3.5) | 0.493 |
| Synchronous/metachronous [n, (%)] | 51/50 | 5/13 | 0.075 | 4/14 | 5/13 | 1 |
| Nodes metastases [n, (%)] | 75 (74.3) | 13 (72.2) | 1 | 13 (72.2) | 13 (72.2) | 1 |
| Preoperative chemotherapy [n, (%)] | 66 (65.4) | 10 (55.6) | 0.426 | 7 (38.9) | 10 (55.6) | 0.317 |
| Number of nodules [median, (IQR)] | 3.0 (1.0–5.0) | 1.0 (1.0–2.0) | <0.001 | 1.0 (1.0–2.0) | 1.0 (1.0–2.0) | 1 |
| Size max of nodule [median, (IQR)] | 35.0 (20.0–52.0) | 28.0 (20.0–45.8) | 0.590 | 42.5 (22.8–115.0) | 28.0 (20.0–45.8) | 0.116 |
| Type of resection [n, (%)] | 0.014 | 1 | ||||
| Major [n, (%)] | 42 (41.6) | 2 (11.1) | 3 (16.7) | 2 (11.1) | ||
| Minor [n, (%)] | 59 (58.4) | 16 (88.9) | 15 (83.3) | 16 (88.9) |
OLR, open liver resection; LLR, laparoscopic liver resection; PSM, propensity score matching; IQR, interquartile range; ASA, American Society of Anesthesiologists; CEA, carcinoembryonic antigen; BMI, body mass index.