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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.