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Table 5 Multivariable analysis (n = 824)

From: Predicting risk of mortality in dialysis patients: a retrospective cohort study evaluating the prognostic value of a simple chest X-ray

Model and variables

Hazard ratio [95% CI]

P value

Model AUROC [95% CI]

Base model (BBM)

 

Model P < 0.01

0.71 [0.66, 0.76]

Age at chest x-ray (per year)

1.05 [1.03, 1.06]

<0.01

 

Sex

0.91 [0.62, 1.30]

0.62

 

Duration of hemodialysis (per year)

0.98 [0.91, 1.01]

0.53

 

Race

 

<0.01

 

Caucasian

1.63 [0.90, 2.90]

0.11

 

Aboriginal

2.9 [1.5, 5.4]

<0.01

 

Other

referent

-

 

Diabetes

0.71 [0.47, 1.07]

0.10

 

Heart failure

1.48 [0.92, 2.39]

0.10

 

Ischemic heart disease

1 [0.61, 1.64]

1.00

 

Creatinine (per 100 mcmol/L)

1.00 [1.00, 1.00]

0.15

 

Phosphate (per mcm/L)

1.0 [0.99, 1.00]

0.38

 

Base model + CTR

 

Model P < 0.01

0.71 [0.66, 0.76]

Age at chest x-ray

1.04 [1.03, 1.05]

<0.01

 

Sex

1.04 [0.73, 1.45]

0.82

 

Duration of hemodialysis

0.97 [0.91, 1.03]

0.33

 

Race

 

0.04

 

Caucasian

1.53 [0.89, 2.62]

0.13

 

Aboriginal

2.03 [1.16, 3.56]

0.01

 

Other

referent

-

 

Diabetes

0.83 [0.57, 1.20]

0.31

 

Heart failure

1.36 [0.91, 2.05]

0.14

 

Ischemic heart disease

0.94 [0.60, 1.46]

0.77

 

Creatinine

1.00 [1.00, 1.00]

0.14

 

Phosphate

1.00 [0.99, 1.00]

0.35

 

CTR

1.46 [1.11, 1.92]

<0.01

 

Best base model + AAC

 

Model P < 0.01

0.72 [0.67, 0.76]

Age at chest x-ray

1.04 [1.02, 1.05]

<0.01

 

Sex

0.97 [0.69, 1.36]

0.86

 

Duration of hemodialysis

0.95 [0.89,1.02]

0.14

 

Race

 

0.02

 

Caucasian

1.44 [0.84, 2.46]

0.19

 

Aboriginal

2.11 [1.20, 3.73]

0.01

 

Other

referent

-

 

Diabetes

0.82 [0.57, 1.19]

0.29

 

Heart failure

1.47 [0.97, 2.21]

0.07

 

Ischemic heart disease

0.85 [0.54, 1.34]

0.48

 

Creatinine

1.00 [1.00, 1.00]

0.14

 

Phosphate

1.00 [0.99, 1.00]

0.33

 

AAC

 

0.03

 

0

referent

  

1

1.52 [0.99, 2.34]

0.06

 

2

1.22 [0.72, 2.05]

0.47

 

3

2.49 [1.28, 4.82]

0.01

 
  1. CTR = Cardiothoracic ratio; AAC = Aortic arch calcification score; AUROC = area under the receiving operator curve.
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