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Table 1 Positivity of sputum samples analyzed by LED-FM, cZN, Xpert and LJ culture singly and in combination. PPV: positive predictive value, NPV: negative predictive value, CI: confidence interval, AIDS: acquired immunodeficiency syndrome, HIV: human immunodeficiency virus

From: Light-emitting diode fluorescent microscopy and Xpert MTB/RIF® assay for diagnosis of pulmonary tuberculosis among patients attending Ambo hospital, west-central Ethiopia

  LED-FM (n = 362) Xpert (n = 362) cZN (n = 362) LJ culture (n = 332)
positive negative positive negative positive negative positive negative
LED-FM positive (36)    36 0 36 0 35 0
negative    14 312 6 320 10 287
Xpert positive(50) 36 14    42 8 42 6
negative 0 312    0 312 3 281
cZN positive (42) 36 6 42 0    37 3
negative 0 320 8 312    8 284
LJ culture positive 35 10 42 3 37 8   
negative 0 287 6 281 3 284