Table 3 Risk factors for severe complications

Age at surgery per 10 year

1.1 (0.9–1.4)

0.161

Male

2.5 (1.5–4.2)

0.001

2.3 (1.4–4.0)

0.002

ASA

 1

Ref

Ref

 2

1.1 (0.5–2.6)

0.808

 3 or more

1.5 (0.6–3.7)

0.394

Liver surgery number

 One, n (%)

Ref

Ref

 Two, n (%)

1.1 (0.6–1.9)

0.790

 Three or more, n (%)

2.0 (0.9–4.3)

0.066

Surgery duration per 30 min

1.2 (1.1–1.4)

 < 0.001

1.1 (1.0–1.3)

0.013

Laparoscopic

NA

NA

Number of local resections

 One

Ref

 Two

0.4 (0.1–1.1)

0.079

 Three

0.4 (0.1–1.9)

0.260

 Four or more

1.3 (0.5–3.4)

0.541

Type of surgery

 Local resection only

Ref

Ref

 4 or more segments

3.4 (1.9–6.0)

 < 0.001

 3 segments

3.8 (1.7–8.7)

0.001

 2 segments

1.1 (0.5–2.7)

0.800

 1 segment

1.3 (0.6–3.1)

0.540

 RFA only

2.2 (0.9–5.1)

0.080

Local resection 4 or more

1.8 (0.7–4.5)

0.190

Major resection (≥ 3 segments)

2.9 (1.8–4.6)

 < 0.001

2.2 (1.3–3.7)

0.003

Extrahepatic resection

0.6 (0.2–1.6)

0.286

Preoperative bilirubin, logarithmic transformed

1.4 (0.9–2.4)

0.2

Preoperative ALAT, logarithmic transformed

1.1 (0.7–1.7)

0.8