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Table 4 Comparison of intraoperative factors and postoperative short-term and long-term results after PS matching

From: Liver resection for colorectal liver-limited metastases in elderly patients: a propensity score matching analysis

Variable Aged < 70 years (n = 128) Aged ≥ 70 years (n = 64) P value Standardized mean difference
Combined with RFA 1 (0.8%) 3 (4.7%) 0.109 0.043
Two-stage hepatectomy 1 (0.8%) 1 (1.6%) 1.000  
Simultaneous resection 17 (13.3%) 16 (25.0%) 0.066  
Major hepatectomy 24 (18.8%) 8 (12.5%) 0.273 0.023
Pringle clamp 95 (74.2%) 44 (68.8%) 0.424  
Pringle clamp time (min) 15 (0–60) 15 (0–60) 0.465  
R1 margin 3 (2.3%) 6 (9.4%) 0.062  
Intraoperative blood loss (ml) 200 (20–6500) 175 (20–800) 0.046  
Intraoperative RBC transfusion 10 (7.9%) 3 (4.7%) 0.549  
Intraoperative RBC transfused (U) 0 (0–8) 0 (0–4) 0.313  
Operation time (min) 172.5 (60–570) 180 (60–327) 0.799  
Hospital stay (days) 11 (4–70) 8 (4–48) 0.020  
Postoperative complications 37 (28.9%) 17 (26.6%) 0.733  
Clavien-Dindo classification    0.062  
 I–II 16 (43.2%) 12 (70.6%)   
 III–V 21 (56.8%) 5 (29.4%)   
General complications 15 (11.7%) 4 (6.3%) 0.232  
 Postoperative heart failure 0 (0.0%) 0 (0%) -  
 Postoperative coronary artery disease 2 (1.6%) 0 (0%) 0.553  
 Postoperative arrhythmia 0 (0.0%) 1 (1.6%) 0.333  
 Postoperative lung infection 1 (0.8%) 1 (1.6%) 1.000  
 Postoperative renal failure 0 (0.0%) 0 (0.0%) -  
 Postoperative pulmonary embolism 1 (0.8%) 0 (0.0%) 1.000  
 Postoperative deep vein thrombosis 0 (0.0%) 0 (0.0%) -  
 Postoperative urinary infection 0 (0.0%) 0 (0.0%) -  
 Postoperative pleural effusion 10 (7.8%) 2 (3.1%) 0.343  
 Postoperative stress ulcer 1 (0.8%) 1 (1.6%) 1.000  
Surgical complications 24 (18.8%) 8 (12.5%) 0.273  
 Posthepatectomy liver failure 2 (1.6%) 1 (1.6%) 1.000  
 Postoperative abdominal infection 3 (2.3%) 5 (7.8%) 0.120  
 Postoperative bile leakage 8 (6.3%) 2 (3.1%) 0.500  
 Postoperative abdominal collection 4 (3.1%) 2 (3.1%) 1.000  
 Incision infection 3 (2.3%) 0 (0.0%) 0.552  
 Postoperative ileus 4 (3.1%) 0 (0.0%) 0.303  
 Postoperative abdominal bleeding 5 (3.9%) 1 (1.6%) 0.666  
ICU 5 (3.9%) 6 (9.4%) 0.185  
ICU stay (days) 2 (1–6) 1.5 (1–6) 0.537  
Postoperative RBC transfusion 11 (8.6%) 7 (10.9%) 0.599  
Postoperative RBC transfused (U) 4 (2–58) 2 (2–6) 0.151  
Reoperation 4 (3.1%) 0 (0.0%) 0.303  
Readmission 0 (0.0%) 3 (4.7%) 0.036  
Mortality (in-hospital) 1 (0.8%) 0 (0.0%) 1.000  
Mortality (90-day) 1 (0.8%) 0 (0.0%) 1.000  
Recurrence 102 (79.7%) 43 (67.2%) 0.058  
 Intrahepatic recurrence 70 (54.7%) 34 (53.1%) 0.838  
 Extrahepatic recurrence 32 (25.0%) 9 (14.1%) 0.081  
Disease-free survival    0.269  
 1-year 43.5% 51.4%   
 3-year 21.2% 30.3%   
 5-year 18.5% 24.1%   
Overall survival    0.401  
 1-year 89.0% 89.1%   
 3-year 47.8% 57.7%   
 5-year 32.7% 45.4%   
Cancer-specific survival    0.163  
 1-year 89.8% 89.1%   
 3-year 48.2% 61.1%   
 5-year 32.9% 48.0%