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Table 4 Predicting the result of mycobacterial culture on smear reversion by four clinical factors.

From: Predicting results of mycobacterial culture on sputum smear reversion after anti-tuberculous treatment: a case control study

Conditions Episodes of
Sm reversion
Cul (+) for Mtb Se Sp PPV NPV
All 1 1 5% 100% 100% 72%
Any three 1 1 5% 100% 100% 72%
Any two 33 21 95% 78% 64% 98%
Anyone 61 22 100% 28% 36% 100%
  1. Abbreviation: Cul, culture; Mtb, Mycobacterium tuberculosis; NPV, negative predictive value; PPV, positive predictive value; Se, sensitivity; Sm, smear; Sp, specificity
  2. The four clinical factors include: 1) any one-drug resistance; 2) smear reversion within 2 months after treatment; 3) smear reversion before culture conversion; and 4) no radiographic improvement before smear reversion