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Table 2 Comparison of intraoperative factors and postoperative short-term and long-term results before PS matching

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

Variable Aged < 70 years (n = 651) Aged ≥ 70 years (n = 73) P value Standardized mean difference
Combined with RFA 85 (13.1%) 3 (4.1%) 0.027 0.486
Two-stage hepatectomy 9 (1.4%) 1 (1.4%) 1.000  
Simultaneous resection 120 (18.4%) 17 (23.3%) 0.315  
Major hepatectomy 127 (19.5%) 9 (12.3%) 1.136 0.127
Pringle clamp 513 (78.8%) 53 (72.6%) 0.224  
Pringle clamp time (min) 20 (0–98) 15 (0–60) 0.061  
R1 margin 96 (14.7%) 7 (9.6%) 0.232  
Intraoperative blood loss (ml) 200 (0–6500) 150 (20–1000) 0.529  
Intraoperative RBC transfusion 28 (4.3%) 5 (6.8%) 0.367  
Intraoperative RBC transfused (U) 4 (1–12) 3 (2–4) 0.269  
Operation time (min) 187 (32–600) 180 (60–330) 0.146  
Hospital stay (days) 9 (4–78) 9 (4–48) 0.909  
Postoperative complications 186 (28.6%) 20 (27.4%) 0.833  
Clavien-Dindo classification    0.262  
 I–II 106 (57.0%) 14 (70.0%)   
 III–V 80 (43.0%) 6 (30.0%)   
General complications 58 (8.9%) 4 (5.5%) 0.321  
 Postoperative heart failure 2 (0.3%) 0 (0%) 1.000  
 Postoperative coronary artery disease 6 (0.9%) 0 (0%) 1.000  
 Postoperative arrhythmia 8 (1.2%) 1 (1.4%) 1.000  
 Postoperative lung infection 5 (0.8%) 1 (1.4%) 0.473  
 Postoperative renal failure 2 (0.3%) 0 (0%) 1.000  
 Postoperative pulmonary embolism 1 (0.2%) 0 (0%) 1.000  
 Postoperative deep vein thrombosis 2 (0.3%) 0 (0%) 1.000  
 Postoperative urinary infection 4 (0.6%) 0 (0%) 1.000  
 Postoperative pleural effusion 28 (4.3%) 2 (2.7%) 0.759  
 Postoperative stress ulcer 6 (0.9%) 1 (1.4%) 0.526  
Surgical complications 129 (19.8%) 11 (15.1%) 0.330  
 Posthepatectomy liver failure 22 (3.4%) 2 (2.7%) 1.000  
 Postoperative abdominal infection 53 (8.1%) 7 (9.6%) 0.671  
 Postoperative bile leakage 37 (5.7%) 3 (4.1%) 0.788  
 Postoperative abdominal collection 22 (3.4%) 2 (2.7%) 1.000  
 Incision infection 9 (1.4%) 0 (0%) 0.610  
 Postoperative ileus 12 (1.8%) 0 (0%) 0.622  
 Postoperative abdominal bleeding 26 (4.0%) 1 (1.4%) 0.508  
ICU 18 (2.8%) 8 (11.0%) 0.003  
ICU stay (days) 1 (1–6) 1.5 (1–6) 0.927  
Postoperative RBC transfusion 50 (7.7%) 7 (9.6%) 0.566  
Postoperative RBC transfused (U) 4 (2–58) 2 (2–6) 0.510  
Reoperation 12 (1.8%) 0 (0%) 0.622  
Readmission 3 (0.5%) 3 (4.1%) 0.016  
Mortality (in-hospital) 1 (0.2%) 0 (0%) 1.000  
Mortality (90-day) 1 (0.2%) 0 (0%) 1.000  
Recurrence 467 (71.7%) 49 (67.1%) 0.409  
 Intrahepatic recurrence 355 (54.5%) 40 (54.8%) 0.966  
 Extrahepatic recurrence 112 (17.2%) 9 (12.3%) 0.290  
Disease-free survival    0.374  
 1-year 46.6% 50.5%   
 3-year 26.2% 31.0%   
 5-year 23.5% 25.5%   
Overall survival    0.219  
 1-year 94.1% 90.4%   
 3-year 60.5% 56.3%   
 5-year 48.7% 43.6%   
Cancer-specific survival    0.512  
 1-year 94.4% 90.4%   
 3-year 61.1% 59.0%   
 5-year 49.2% 45.7%