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Table 1 Baseline statistics and early postoperative complications of the two groups of CABG operated patients before and after matching

From: Long-term clinical outcomes after coronary artery bypass grafting with pedicled saphenous vein grafts

    Propensity score-matched cohort
  Conventional No-touch Conventional No-touch Standardized differences
Study population 26,437 1371 1349 1349  
Year of surgery:
 2005–2006 6240 (23.6%) 381 (27.8%) 345 (25.6%) 381 (28.2%) 0.06
 2007–2008 5856 (22.2%) 283 (20.6%) 303 (22.5%) 283 (21.0%) 0.04
 2009–2010 4780 (18.1%) 231 (16.8%) 232 (17.2%) 226 (16.8%) 0.01
 2011–2012 4149 (15.7%) 181 (13.2%) 164 (12.2%) 174 (12.9%) 0.02
 2013–2015 5412 (20.5%) 295 (21.5%) 305 (22.6%) 285 (21.1%) 0.04
Age (years):
 40–50 1042 (3.9%) 47 (3.4%) 35 (2.6%) 46 (3.4%) 0.05
 50–60 4715 (17.8%) 251 (18.3%) 234 (17.3%) 244 (18.1%) 0.02
 60–65 4734 (17.9%) 256 (18.7%) 255 (18.9%) 254 (18.8%) 0.00
 65–70 5659 (21.4%) 313 (22.8%) 310 (23.0%) 307 (22.8%) 0.01
 70–75 5740 (21.7%) 316 (23.0%) 305 (22.6%) 311 (23.1%) 0.01
 75–80 4547 (17.2%) 188 (13.7%) 210 (15.6%) 187 (13.9%) 0.05
Female 4853 (18.4%) 207 (15.1%) 197 (14.6%) 201 (14.9%) 0.01
BMI:
 < 25 6903 (28.4%) 373 (27.2%) 387 (28.7%) 365 (27.1%) 0.04
 25–30 11,631 (47.8%) 674 (49.2%) 664 (49.2%) 668 (49.5%) 0.01
  > 30 5785 (23.8%) 323 (23.6%) 298 (22.1%) 316 (23.4%) 0.03
  BMI not recorded 2118 (8.0%) 1 (0.1%)    
Diabetes 6757 (26.1%) 329 (24.0%) 315 (23.4%) 321 (23.8%) 0.01
  Presence of diabetes not recorded 584 (2.2%) 1 (0.1%)    
Renal impairment:
  Normal, (CC > 85 ml/min) 12,149 (50.1%) 742 (54.2%) 691 (51.2%) 729 (54.0%) 0.06
  Moderately impaired (50–85 ml/min) 10,248 (42.3%) 552 (40.3%) 585 (43.4%) 546 (40.5%) 0.06
  Severely impaired (< 50 ml/min) off dialysis 1596 (6.6%) 69 (5.0%) 71 (5.3%) 68 (5.0%) 0.01
  On dialysis 253 (1.0%) 6 (0.4%) 2 (0.2%) 6 (0.4%) 0.05
  Renal impairment not recorded 2191 (8.3%) 2 (0.2%)    
COPD 1872 (7.3%) 58 (4.3%) 56 (4.2%) 58 (4.3%) 0.01
  COPD not recorded 961 (3.6%) 12 (0.9%)    
Extracardiac arteriopathy 2166 (8.3%) 88 (6.4%) 82 (6.1%) 88 (6.5%) 0.02
  Extracardiac arteriopathy not recorded 305 (1.2%) 5 (0.4%)    
Neurological disability 554 (2.2%) 45 (3.3%) 44 (3.3%) 45 (3.3%) 0.00
  Neurological disability not recorded 971 (3.7%) 1 (0.1%)    
Ejection fraction:
  Normal 18,161 (69.5%) 1055 (77.1%) 1065 (78.9%) 1046 (77.5%) 0.03
  30–50% 6682 (25.6%) 259 (18.9%) 242 (17.9%) 251 (18.6%) 0.02
   < 30% 1289 (4.9%) 54 (3.9%) 42 (3.1%) 52 (3.9%) 0.04
  Ejection fraction not recorded 305 (1.2%) 3 (0.2%)    
MI last 90 days 10,853 (41.5%) 500 (36.5%) 492 (36.5%) 487 (36.1%) 0.01
  Prior MI not recorded 304 (1.1%) 0 (0.0%)    
Previous PCI 3537 (16.1%) 269 (19.7%) 254 (18.8%) 263 (19.5%) 0.02
  Previous PCI not recorded 4492 (17.0%) 5 (0.4%)    
Emergency surgery 1124 (4.3%) 53 (3.9%) 47 (3.5%) 49 (3.6%) 0.01
  Urgency not recorded 62 (0.2%) 0 (0.0%)    
Number of distal anastomoses:
 2 5565 (21.1%) 187 (13.6%) 202 (15.0%) 183 (13.6%) 0.04
 3 11,605 (43.9%) 458 (33.4%) 467 (34.6%) 451 (33.4%) 0.03
 4 7019 (26.5%) 532 (38.8%) 469 (34.8%) 521 (38.6%) 0.08
 5+ 2248 (8.5%) 194 (14.2%) 211 (15.6%) 194 (14.4%) 0.04
 Off-pump 130 (0.5%) 81 (5.9%) 81 (6.0%) 81 (6.0%) 0.00
  1. CABG indicates coronary artery bypass grafting, SD standard deviation, CC creatinine clearence, COPD chronic obstructive pulmonary disease, PCI percutaneous coronary intervention, MI myocardial infarction; Standardized difference = |PNT − PC|/√((PNT (1 − PNT) + PC (1 − PC))/2)