Table 1. Baseline Patient Characteristics and Perioperative Data.
| Characteristics | Participants, No. (%) (N = 201) |
|---|---|
| Age, median (IQR), y | 65 (57-72) |
| Sex | |
| Female | 85 (42.3) |
| Male | 116 (57.7) |
| Location of primary tumor (n = 199)a | |
| Ascending colon | 40 (20.1) |
| Transverse colon | 6 (3.0) |
| Descending colon | 9 (4.5) |
| Sigmoid | 72 (36.2) |
| Rectum | 72 (36.2) |
| T stage | |
| T1 | 8 (4.0) |
| T2 | 23 (11.6) |
| T3 | 135 (67.8) |
| T4 | 33 (16.6) |
| N stage | |
| N0 | 63 (31.8) |
| N1 | 90 (45.5) |
| N2 | 45 (22.7) |
| M stage | |
| M0 | 99 (49.0) |
| M1 | 102 (51.0) |
| Serum carcinoembryonic antigen, ng/mL, median (IQR) | 5.9 (2.7-15.0) |
| No. of suspected CRLM lesions, mean (SD) | 2.17 (2.30) |
| Size of largest lesion, mm, median (IQR) | 22 (14-35) |
| Neoadjuvant chemotherapy | 58 (28.9) |
| Surgery characteristics, median (IQR) | |
| Operation time, min | 157 (30-450) |
| Estimated blood loss, mL | 150 (50-350) |
| Hospital stay, d | 3 (2-4) |
| Clavien-Dindo classificationb | |
| No complication | 169 (84.1) |
| Low | 15 (7.5) |
| High | 11 (5.5) |
| Missing | 6 (3.0) |
Abbreviation: CRLM, colorectal liver metastases.
SI conversion: To convert carcinoembryonic antigen to micrograms per liter, multiply by 1.0.
a
Data from 2 patients were missing because they were referred from a center outside of the Netherlands, and both patients were unaware of the location of their primary tumor.
b
Classifications range from 0 to 5, with 3 to 5 indicting more severe postoperative complications.