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Table 4 Results of multivariate logistic regression analysis comparing outcomes between (1) high vs. low volume centers and (2) high vs. intermediate volume centers

From: Outcomes following emergent open repair for thoracic aortic dissection are improved at higher volume centers in direct admissions and transfers

Variable

Odds ratio

Standard error

95 % confidence interval

p-value

High volume vs. low volume centers

 Low volume

2.06

0.52

1.25 – 3.38

0.004

 Direct admission

1.02

0.17

0.73 – 1.43

0.907

 Transfer admission

0.99

0.29

0.56 – 1.75

0.964

 Other admission

1.00

0.00

N/A

1.000

 Age

1.02

0.01

1.01 – 1.03

0.001

 APRDRG risk of mortality

2.20

0.36

1.60 – 3.03

<0.001

High volume vs. intermediate volume centers

 Intermediate volume

1.45

0.41

0.83 – 2.54

0.195

 Direct admission

0.90

0.24

0.53 – 1.52

0.692

 Transfer admission

0.58

0.22

0.27 – 1.22

0.152

 Other admission

1.00

0.00

N/A

1.000

 Age

1.03

0.01

1.01 – 1.05

0.005

 APRDRG risk of mortality

3.61

1.09

2.00 – 6.51

<0.001