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Table 3 Sensitivity, specificity, PPV and NPV of sputum microscopy of the selected laboratories from December 2011 to December 2012

From: External quality assessment for acid fast bacilli smear microscopy in eastern part of Ethiopia

Laboratories coded Sensitivity (%) Specificity (%) PPV (%) NPV (%) Kappa value
1 85 100 100 94 0.89
2 100 100 100 100 1
3 75 100 100 95.2 0.83
4 50 100 100 87 0.74
5 100 100 100 100 1
6 100 100 100 100 1
7 90.9 100 100 94.4 0.92
8 66.7 82.6 33.3 95 0.34
Average 83.54 97.82 91.7 95.75 0.84