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Table 5 Multivariate analysis of clinical characteristics predictive of smear negative culture positive PTB

From: Sputum smear negative pulmonary tuberculosis: sensitivity and specificity of diagnostic algorithm

Characteristics OR Confidence interval P-value
Respiratory rate > 20/min 2.4 1.2-4.4 0.0054
  < 20/min 1   
Eosinophilia < 0.4 1   
  > 0.4 0.5 0.2-0.8 0.0094
Cavity Abscent 1   
  Present 74.3 9.4-587 0.0000
RBC morphology Normocytic 1   
  Microcytic 0.8 0.4-1.7 0.6
  Macrocytic 0.01 0.000-39171193 0.69
  Mixed 2 1.2-3.7 0.01