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Table 2 Association of seven potential risk factors with TST or QFT-G positivity

From: Risk factors for latent tuberculosis infection in close contacts of active tuberculosis patients in South Korea: a prospective cohort study

 

TST positive, n (%)

p value

QFT-G positive, n (%)

p value

Age

 

< 0.001

 

0.063

15 - 24

2 (7.1)

 

2 (10.5)

 

25 - 34

16 (26.2)

 

6 (14.3)

 

35 - 44

39 (52.0)

 

19 (36.5)

 

45 - 54

34 (47.2)

 

16 (33.3)

 

55 - 64

16 (39.0)

 

10 (34.5)

 

≥ 65

9 (32.1)

 

6 (37.5)

 

Gender

 

0.001

 

0.176

Male

53 (51.5)

 

23 (34.8)

 

Female

63 (31.2)

 

36 (25.7)

 

BCG vaccination scar

 

0.430

 

0.092

Yes

108 (37.5)

 

53 (27.3)

 

No

8 (47.1)

 

6 (50.0)

 

Household contact

 

0.023

 

0.033

Yes

72 (43.9)

 

37 (35.2)

 

No

44 (31.2)

 

22 (21.8)

 

History of pulmonary TB

 

0.001

 

0.028

Yes

16 (72.7)

 

8 (53.3)

 

No

100 (35.3)

 

51 (26.7)

 

Smear status of source cases

 

0.139

 

0.118

Positive

95 (40.3)

 

48 (31.6)

 

Negative

21 (30.4)

 

11 (20.4)

 

Cough of source cases

 

0.053

 

0.094

Yes

78 (42.4)

 

40 (33.1)

 

No

38 (31.4)

 

19 (22.4)

 
  1. TB Tuberculosis, BCG Bacillus of Calmette-Guerin, TST Tuberculin skin test, QFT-G QuantiFERON®-TB GOLD.