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Table 1 Demographic and clinical characteristics of all sputum smear-negative TB suspects

From: Fiberoptic bronchoscopy for the rapid diagnosis of smear-negative pulmonary tuberculosis

Characteristic All suspects TB Non-TB P-value
  N = 126 N = 54 N = 72  
Age, years (mean ± SD) 51.0 ± 18.2 45.3 ± 18.8 55.4 ± 16.6 0.002
Male, n (%) 68 (54.0) 26 (48.1) 42 (58.3) 0.256
Previous TB history, n (%) 33 (26.2) 8 (14.8) 25 (34.7) 0.014
Immunocompromised patient, n (%) 11 (8.7) 4 (7.4) 7 (9.7) 0.649
CXR positivity, n (%) 44 (34.9) 29 (53.7) 15 (20.8) < 0.001
QFT-IT positivity*, n (%) 33/51 (64.7) 20/23 (87.0) 13/28 (46.4) 0.009
Active pulmonary TB, n (%) 54 (42.9) 54 (100.0)   
 Culture confirmed, n (%)   48 (88.9)   
 Biopsy confirmed, n (%)   6 (11.1)   
  1. Definition of abbreviations: TB = tuberculosis, SD = standard deviation, n = number, CXR = chest x-ray, QFT-IT = QuantiFERON®-TB Gold In-Tube.
  2. *51 of 126 cases were examined with this test.
  3. Of the 48 culture-confirmed cases, 28 showed cultures positive in both sputum and bronchial washing specimens, 6 only in sputum and 14 only in bronchial washing specimens.