Table 1.
Baseline characteristics stratified by BMI.
| All | Underweight | Normal BMI | Overweight | Obese | ||
|---|---|---|---|---|---|---|
| n=3383 | (BMI < 18.5 kg/m2) | (BMI 18.5–24.9 kg/m2) | (BMI 25.0–29.9kg/m2) | (BMI ≥ 30.0 kg/m2) | p-value | |
| n=124 | n=1810 | n=1057 | n=392 | |||
|
| ||||||
| Median age (IQR), yrs | 62 (52–71) | 61 (48–71) | 62 (52–71) | 63 (54–71) | 62 (53–71) | 0.519 |
| Male gender, n (%) | 2093/3381 (61.9%) | 64/124 (51.6%) | 1104/1809 (61.0%) | 710/1056 (67.2%) | 215/392 (54.8%) | <0.001 |
| Previous abdominal surgery, n (%) | 1097/3360 (32.6%) | 44/124 (35.5%) | 524/1801 (29.1%) | 362/1048 (34.5%) | 167/387 (43.2%) | <0.001 |
| ASA score, n (%) | <0.001 | |||||
| 1–2 | 2555 (75.5%) | 106 (85.5%) | 1413 (78.0%) | 778 (73.6%) | 258 (65.8%) | |
| 3–4 | 828 (24.5%) | 18 (14.5%) | 397 (22.0%) | 279 (26.4%) | 134 (34.2%) | |
| Malignant neoplasm, n (%) | 2803/3382 (82.9%) | 106/124 (85.5%) | 1503/1810 (83.0%) | 885/1056 (83.8%) | 309/392 (78.8%) | 0.134 |
| Disease | 0.006 | |||||
| HCC/ICC | 1767/3382 (52.2%) | 63/124 (50.8%) | 985/1810 (54.4%) | 553/1056 (52.4%) | 166/392 (42.3% | |
| CRLM | 848/3382 (25.1%) | 35/124 (28.2%) | 424/1810 (23.4%) | 275/1056 (26.0%) | 114/392 (29.1%) | |
| Other metastases | 143/3382 (4.2%) | 7/124 (5.6%) | 72/1810 (4.0%) | 41/1056 (3.9%) | 23/392 (5.9%) | |
| Benign | 624 (18.5%) | 19/124 (15.3%) | 329 (18.2%) | 187/1056 (17.7%) | 89/392 (22.7%) | |
| Median tumor size, mm (IQR) | 42 (25–70) | 40 (28–67) | 40 (25–70) | 44 (25–70) | 46 (30–70) | 0.332 |
| Multiple tumors, n (%) | 968/3382 (28.6%) | 41/124 (33.1%) | 501/1810 (27.7%) | 295/1056 (27.9%) | 131/392 (33.4%) | 0.085 |
| Formal major (>3 segments), n (%) | 2459 (72.7%) | 93 (75.0%) | 1305 (72.1%) | 770 (72.8%) | 291 (74.2%) | 0.785 |
| Technical major, n (%) | 923 (27.3%) | 31 (25.0%) | 505 (27.9%) | 286 (27.1%) | 101 (25.8%) | 0.884 |
| Difficult segments (I, IVa, VII, VIII), n (%) | 2503 (74.0%) | 94 (75.8%) | 1346 (74.4%) | 775 (73.3%) | 288 (73.5%) | 0.891 |
| Multiple resections, n (%) | 269 (8.0%) | 12 (9.7%) | 150 (8.3%) | 77 (7.3%) | 30 (7.7%) | 0.664 |
| Median Iwate difficulty score, (IQR) | 10 (9–11) | 10 (9–11) | 10 (9–11) | 10 (9–11) | 10 (9–10) | 0.759 |
| Iwate difficulty score, n (%) | 0.412 | |||||
| Low | 0/3380 (0.0%) | 0/124 (0.0%) | 0/1810 (0.0%) | 0/1056 (0.0%) | 0/390 (0.0%) | |
| Intermediate | 122/3380 (3.6%) | 5/124 (4.0%) | 68/1810 (3.8%) | 40/1056 (3.8%) | 9/390 (2.3%) | |
| High | 1250/3380 (37.0%) | 36/124 (29.0%) | 666/1810 (36.8%) | 402/1056 (38.1%) | 146/390 (37.4%) | |
| Expert | 2008/3380 (59.4%) | 83/124 (66.9%) | 1076/1810 (59.4%) | 614/1056 (58.1%) | 235/390 (60.3%) | |
| IMM difficulty, n (%) | 0.453 | |||||
| I | 1/3383 (0.0%) | 0 (0.0%) | 1 (0.1%) | 0 (0.0%) | 0 (0.0%) | |
| II | 1013 (29.9%) | 45 (36.3%) | 526 (29.1%) | 318 (30.1%) | 124 (31.6%) | |
| III | 2369 (70.0%) | 79 (63.7%) | 1283 (70.9%) | 739 (69.9%) | 268 (68.4%) | |
IQR, interquartile range; ASA, American Society of Anesthesiology; HCC, hepatocellular carcinoma; ICC, Intrahepatic cholangiocarcinoma; CRLM, colorectal liver metastases; IMM, Institut Mutualiste Montsouris.