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Table 3 Diagnostic tests and drug resistances in older and younger tuberculosis patients

From: Clinical characteristics and treatment outcomes of tuberculosis in the elderly: a case control study

Characteristics Older Younger p-value
Positive AFB smear 67/190 (35) 66/247 (27) 0.060
Positive culture for M.TB 155/191 (81) 169/248 (68) 0.002
Positive TB PCR 146/190 (77) 168/247 (68) 0.053
Positive IGRA 56/63 (89) 87/97 (90) 1.000
Positive tuberculin skin test 86/92 (93) 133/143 (93) 1.000
Confirmed by bronchoscopy in pulmonary TB* 64/173 (37) 53/222 (24) 0.005
Drug resistances    
 Resistance to INH 10/137 (7) 15/160 (9) 0.665
 Multi-drug resistance 1/137 (1) 6/160 (4) 0.185
  1. The data are presented as n (%).
  2. *: included both of the pulmonary tuberculosis, and pulmonary and extrapulmonary tuberculosis.
  3. IGRA = interferon gamma releasing assay, INH = isoniazid, MDR = multi-drug resistant, M.TB = Mycobacterium tuberculosis, RFP = rifampin.