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Table 1 The risk for TB in dialysis patients by TST at onset, chest radiography and dialysis stage

From: Risk factors for tuberculosis in dialysis patients: a prospective multi-center clinical trial

Characteristic (%)

Population at risk

TB cases

TB rate

RR

Adj RR

95% CI

TST at inclusion (mm)

   0-4

183

14

7.65

69.5

24.5

22.5-26.5

   5-9

27

2

7.40

67.2

8.4

3.1-13.6

   ≥10

62

8

12.0

109.0

41.4

37.9-44.8

r

  

0.84

 

0.51

 

P value

  

0.02

 

0.03

 

Inactive-TB evidence on chest x-ray

   Yes

67

10

14.9

135.4

82.3

51.3-95.5

   No

205

14

5.4

49.9

21.3

19.8-22.8

Ratio

0.06

 

10.8

2.7

3.8

 

P value

  

< 0.001

 

< 0.001

 

Dialysis stage in months

   0-12

67

16

23.82

216.3

110.0

97.4-135.3

   13-60

149

3

2.01

18.3

9.3

5.2-14.6

   ≥60

56

5

8.92

81.0

41.3

31.3-56.8

r

  

-0.46

 

-0.58

 

P value

  

< 0.001

 

< 0.001

 
  1. RR: relative risk taking as reference group subjects from the general population, Adj RR: adjusted relative risk after allowing for the effect of the other characteristics, CI: Wald 95% Confidence Interval, r: correlation coefficient, P value: for the differences between groups