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Table 2 Adjusted odds ratios of postoperative 4AT score ≥ 4 associated with selected preoperative risk factors

From: Edmonton frailty scale score predicts postoperative delirium: a retrospective cohort analysis

Models and variables

Odds ratio

95% Confidence limits

P

Bivariable models

 Model 1

  EFS score ≥ 6, yes vs no

4.86

1.62

14.58

0.005

  Age, per 5-year increase

1.37

1.14

1.54

0.09

 Model 2

  EFS score ≥ 6, yes vs no

5.25

1.74

15.88

0.003

  ASA

   

0.08a

   2 vs 4

0.24

0.04

1.35

0.10

   3 vs 4

0.24

0.07

0.87

0.03

 Model 3

  EFS score ≥ 6, yes vs no

3.86

1.26

11.80

0.018

  Elixhauser 30-day readmission score, per 10-point increase

1.32

1.14

1.53

0.0002

Multivariable model

 EFS score ≥ 6, yes vs no

3.49

1.06

11.54

0.04

 Age, per 5-year increase

1.41

0.95

2.09

0.09

 ASA

   

0.33a

  2 vs 4

0.67

0.09

5.22

0.70

  3 vs 4

0.35

0.08

1.59

0.17

 Elixhauser 30-day readmission score, per 10-point increase

1.27

1.07

1.50

0.007

  1. ASA American Society of Anesthesiologists, EFS Edmonton Frailty Scale
  2. aType 3 Wald’s chi-square test