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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