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Table 1 Baseline characteristics of the study population.

From: The clinical utility of tuberculin skin test and interferon-γ release assay in the diagnosis of active tuberculosis among young adults: a prospective observational study

Characteristics

TB (n = 100)

Non-TB (n = 43)

P value

Age, median(range), yrs

22(20-30)

21(20-26)

0.02

Male Gender

98(98)

43(100)

0.87

Smoking History

   

   Non-smoker

50(50.0)

22(51.2)

0.46

   Ex-smoker

3(3.0)

4(9.3)

 

   Current smoker

47(47.0)

17(39.5)

 

BCG scar present

70(70.0)

32(74.4)

0.59

Sputum AFB smear

   

   Negative

99(99.0)

39(90.7)

<0.05

   Non-productive

1(1.0)*

4(9.3)

 

Symptom present

   

   Cough

52(52.0)

29(67.4)

0.09

   Sputum

39(39.0)

28(65.1)

<0.01

   Hemoptysis

10(10.0)

8(18.6)

0.15

Peak BT(°C), mean ± SD

37.1 ± 0.8

37.6 ± 1.1

0.01

WBC(×103cells/uL), mean ± SD

6.89 ± 1.85

8.33 ± 5.21

0.09

CRP(mg/dL), mean ± SD

2.02 ± 3.32

6.35 ± 8.98

<0.01

Final Diagnosis

   

Culture-positive pulmonary TB

41(41.0)

  

Clinical pulmonary TB

35(35.0)

  

Extrapulmonary TB

24(24.0)

  

Pleural TB

19(19.0)

  

Lymph node TB

2(2.0)

  

Other site

3(3.0)

  

Pneumonia

 

30(69.8)

 

Paragonimiasis

 

3(7.0)

 

Empyema

 

2(4.7)

 

Other diagnoses

 

8(18.6)

 
  1. Data are no.(%) of patients, unless otherwise indicated.
  2. BCG, Bacille Calmette-Guerin; BT, body temperature; WBC, white blood cell; CRP, C-reactive protein; AFB, acid-fast bacilli; TB, tuberculosis
  3. * Mycobacterium tuberculosis was isolated on bronchial washing fluid.
  4. Four subjects include two with reactive lymphadenopathy, one with malignant lymphoma and one with paragonimiasis.