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. 2024 Apr 19;7(4):e246548. doi: 10.1001/jamanetworkopen.2024.6548

Table 1. Baseline Patient Characteristics and Perioperative Data.

Characteristics Participants, No. (%) (Nā€‰=ā€‰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.