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Table 6 Cox regression models for cumulative all-cause mortality after off-pump coronary artery bypass graftinga

From: Intraoperative mild hyperoxia may be associated with improved survival after off-pump coronary artery bypass grafting: a retrospective observational study

  Univariable P Multivariable 1b P Multivariable 2c P
HR (95% CI) HR (95% CI) HR (95% CI)
Normoxia/near-normoxia Reference   Reference   Reference  
Mild hyperoxia 0.69 (0.51–0.93) 0.016 0.82 (0.60–1.11) 0.199 0.72 (0.52–0.99) 0.048
Severe hyperoxia 1.12 (0.72–1.74) 0.627 1.41 (0.89–2.24) 0.141 1.05 (0.65–1.69) 0.851
  1. HR Hazard ratio, CI Confidence interval
  2. aTwenty-two patients were not included because their survival data were not available
  3. bModel 1 was adjusted for variables consisting of the European System for Cardiac Operative Risk Evaluation II model (see the “Methods” section)
  4. cModel 2 was adjusted for all variables used in model 1 and demographic data and perioperative variables listed in Table 1 (see the “Methods” section)