| |
Co-efficient
|
SE
|
Adjusted OR (95% CI)
|
P Value
|
|---|
|
Renal dysfunction
|
1.6066
|
0.2162
|
4.99 (3.3 – 7.6)
|
<0.001
|
|
Angina class IV
|
0.4950
|
0.1048
|
1.64 (1.3 – 2.0)
|
<0.001
|
|
Ejection fraction <30%
|
0.7771
|
0.1397
|
2.17 (1.6 – 2.9)
|
<0.001
|
|
Peripheral vascular disease
|
0.4809
|
0.1288
|
1.62 (1.2 – 2.1)
|
<0.001
|
|
BMI ≥ 30 and <35 kg/m2
|
0.3338
|
0.1194
|
1.39 (1.1 – 1.8)
|
0.005
|
|
BMI ≥ 35 kg/m2
|
0.7436
|
0.1935
|
2.1 (1.4 – 3.1)
|
<0.001
|
|
Age ≥ 70 and <75 years
|
0.5313
|
0.1283
|
1.7 (1.3 – 2.2)
|
<0.001
|
|
Age ≥ 75 years
|
0.7972
|
0.1640
|
2.22 (1.6 – 3.1)
|
<0.001
|
|
Current smoker
|
0.5238
|
0.1291
|
1.69 (1.3 – 2.2)
|
<.0001
|
|
Diabetes
|
0.4381
|
0.1207
|
1.55 (1.2 – 2.0)
|
<0.001
|
|
Emergent procedure
|
0.7124
|
0.2510
|
2.04 (1.2 – 3.3)
|
0.004
|
|
Hypercholesterolaemia
|
0.3507
|
0.1282
|
1.42 (1.1 – 1.8)
|
0.006
|
|
Hypertension
|
0.2577
|
0.1039
|
1.29 (1.1 – 1.6)
|
0.013
|
|
Use of CPB
|
0.8904
|
0.1734
|
2.44 (1.7 – 3.4)
|
<0.001
|
|
Intercept
|
-4.4390
| | | |
- Calculation of predicted risk using patient data and logistic regression co-efficients:
- Calculate the odds of prolonged intensive care unit stay = exp (-4.4390 + [1.6066 × renal dysfunction] + [0.4950 × angina class IV] + [0.7771 × ejection fraction <30%] + [0.4809 × peripheral vascular disease] + [0.3338 × BMI ≥ 30 and <35 kg/m2] + [0.7436 × BMI ≥ 35 kg/m2] + [0.5313 × age ≥ 70 and < 75 years] + [0.7972 × age ≥ 75 years] + [0.5238 × current smoker] + [0.4381 × diabetes] + [0.7124 × emergent procedure] + [0.3507 × hypercholesterolaemia] + [0.2577 × hypertension] + [0.8904 × use of CPB]).
- Predicted risk of prolonged intensive care unit stay as a percentage = [odds/(1 + odds)] × 100.
- SE, Standard Error; OR, Odds Ratio; CI, Confidence Intervals; BMI, Body Mass Index; CPB, Cardiopulmonary Bypass.
