Skip to main content

Table 1 Demographics comparison of the elderly and younger patients 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
Age (years) 56 (19–69) 73 (70–83) < 0.001  
Gender, male 417 (64.1%) 51 (69.9%) 0.325 0.173
ASA    < 0.001 0.487
 I–II 596 (91.6%) 48 (65.8%)   
 III–IV 55 (8.4%) 25 (34.2%)   
Comorbidity 274 (42.1%) 50 (68.5%) < 0.001 0.564
 Cerebrovascular disease 17 (2.6%) 5 (6.8%) 0.061 0.134
 Arrhythmia 9 (1.4%) 1 (1.4%) 1.000 <0.001
 Ischemic heart disease 36(5.5%) 9(12.3%) 0.036 0.474
 Diabetes mellitus 94 (14.4%) 15 (20.5%) 0.166 0.265
 Hypertension 178 (27.3%) 40 (54.8%) < 0.001 0.648
 Chronic obstructive pulmonary disease 5 (0.8%) 2 (2.7%) 0.151 0.362
 Chronic renal dysfunction 4 (0.6%) 1 (1.4%) 0.413 0.242
 Accompanying liver disease 29 (4.5%) 2 (2.7%) 0.760 0.198
Primary tumor sideness    0.198  
 Right side 112 (17.2%) 17 (23.3%)   
 Left side 539 (82.8%) 56 (76.7%)   
Primary T    0.659  
 pT1-T2 64 (9.8%) 6 (8.2%)   
 pT3-T4 587 (90.2%) 67 (91.8%)   
Primary N    0.869 0.087
 pN0 199 (30.6%) 23 (31.5%)   
 pN1-2 452 (69.4%) 50 (68.5%)   
Number of liver metastases(LM)   0.032 0.674
 ≤ 3 447 (68.7%) 59 (80.8%)   
 > 3 204 (31.3%) 14 (19.2%)   
Distribution of LM    0.084  
 Unilobar 341 (52.4%) 46 (63.0%)   
 Bilobar 310 (47.6%) 27 (37.0%)   
Maximum diameter of LM    0.631  
 ≤ 5 cm 566 (86.9%) 62 (84.9%)   
 > 5 cm 85 (13.1%) 11 (15.1%)   
Temporal relationship    0.796  
 Synchronous 367 (56.4%) 40 (54.8%)   
 Metachronous 284 (44.6%) 33 (45.2%)   
Preoperative chemotherpy cycles   0.025 0.743
 ≤ 6 cycles 565 (86.8%) 70 (95.9%)   
 > 6 cycles 86 (13.2%) 3 (4.1%)   
Preoperative clinical risk score (CRS)   0.590 0.234
 0–2 344 (52.8%) 41 (56.2%)   
 3–5 307 (47.2%) 32 (43.8%)   
RAS/BRAF mutation 215(33.0%) 27(37.0%) 0.496 0.286
Preoperative CEA (ng/ml) 8.19 (0.47–1351.00) 8.53 (1.23–224.80) 0.566 0.344
Preoperative CA199(U/ml) 22.03 (0.00–29909.00) 24.56 (0.00–1354.00) 0.633  
Repeat resection after recurrence 73 (11.2%) 8 (11.0%) 0.948 0.063
Postoperative chemotherapy 442 (67.9%) 40 (54.8%) 0.024 0.766