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Table 1 ARISCAT risk score - Independent predictors of risk for post-operative pulmonary complications identified in the logistic regression model

From: Rationale and study design of PROVHILO - a worldwide multicenter randomized controlled trial on protective ventilation during general anesthesia for open abdominal surgery

  Multivariate Analysis OR (95% CI) n = 1,624 β Coefficient Risk Score†
Age (years)    
≤ 50 1   
51 - 80 1.4 (0.6 - 3.3) 0.331 3
>80 5.1 (1.9 - 13.3) 1.619 16
Pre-operative (SpO2, %)    
≥ 96 1   
91 - 95 2.2 (1.2 - 4.2) 0.802 8
≤ 90 10.7 (4.1 - 28.1) 2.375 24
Respiratory infection 5.5 (2.6 - 11.5) 1.698 17
in the last month    
Pre-operative anemia (≤ 10 g/dl) 3.0 (1.4 - 6.5) 1.105 11
Surgical incision    
Peripheral 1   
Upper abdominal 4.4 (2.3 - 8.5) 1.480 15
Intra-thoracic 11.4 (4.9 - 26.0) 2.431 24
Duration of surgery (hours)    
≤ 2 1   
2 - 3 4.9 (2.4 - 10.1) 1.593 16
>3 9.7 (4.7 - 19.9) 2.268 23
Emergency procedure 2.2 (1.0 - 4.5) 0.768 8
High or intermediate risk for postoperative pulmonary complications following abdominal surgery: risk score ≥ 26
  1. Abbreviations: CI, confidence interval; OR, odds ratio; SpO2, oxyhemoglobin saturation by pulse oximetry breathing air in supine position; g/dL, gram per decilitre † The simplified risk score was the sum of each logistic regression coefficient multiplied by 10, after rounding off its value