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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