Table 4 Logistic regression analysis to examine risk factors for major postoperative complications

 Age: ≥80 vs < 80 (years)

1.965

1.009

3.828

0.046

1.575

0.752

3.298

0.228

 BMI

0.959

0.886

1.037

0.291

 Platelet count (10⁴/uL)

1.016

0.981

1.051

0.370

 Total Bilirubin (mg/dl)

1.062

0.863

1.309

0.566

 PNI: <  50 vs ≥ 50

2.395

1.331

4.312

0.002

2.072

1.143

3.961

0.027

 AST (U/L)

1.001

0.998

1.005

0.308

 ALT (U/L)

1.003

0.998

1.009

0.183

 Prothrombin time (INR)

1.106

0.184

6.623

0.912

 Total Cholesterol (mg/dL)

1.001

0.995

1.006

0.717

 CRP (mg/dl)

1.082

0.970

1.207

0.162

 Preoperative chemotherapy

2.928

0.639

13.42

0.167

 Morphology: Mass-forming vs the other type

0.806

0.440

1.479

0.487

 Tumor size (cm)

1.049

0.957

1.151

0.298

 Multi-nodular

1.382

0.724

2.637

0.326

 Localization: Hilar vs Peripheral

2.523

1.151

5.530

0.020

2.548

1.143

5.683

0.022

 CEA (ng/ml)

1.003

0.992

1.013

0.608

 CA19–9 (U/ml)

1.000

0.999

1.000

0.827

 Vascular invasion*

1.172

0.680

2.020

0.566

 Lymph node metastasis

1.122

0.579

2.171

0.732

 Tumor differentiation: mod/por vs well

1.662

0.889

3.111

0.112

 Major hepatectomy vs Minor hepatectomy

1.570

0.832

2.962

0.153

 Lymph node dissection

1.254

0.686

2.294

0.460

 Bile duct resection

3.456

1.948

6.129

0.001

1.135

0.491

2.625

0.767

 Vascular reconstruction**

2.473

1.030

5.937

0.042

1.061

0.393

2.870

0.906

 Blood loss (ml)

1.001

1.000

1.001

0.032

1.000

0.999

1.000

0.612

 Operation time (min)

1.004

1.002

1.006

0.001

1.003

1.000

1.006

0.026