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Table 3 Summary of RDT performances according to periods

From: Performance of plague rapid diagnostic test compared to bacteriology: a retrospective analysis of the data collected in Madagascar

 

Concordance rate

Kappa Coefficient

Sensitivity

Specificity

PPV

NPV

Bubonic plague

  

2002–2007

86%

0.70 [0.67–0.73]

100% [99.7–100%]

67% [64–70%]

80% [78–82%]

100% [99–100%]

2017–2018

94%

0.86 [0.67–1.04]

100% [85–100%]

82% [48–98%]

92% [73–99%]

100% [66–100%]

2018–2019

85%

0.70 [0.59–0.81]

100% [94–100%]

76% [66–84%]

71% [60–81%]

100% [95–100%]

Pneumonic plague

2002–2007

70%

0.43 [0.32–0.55]

100% [91–100%]

59% [49–68%]

47% [36–58%]

100% [94–100%]

2017–2018

61%

- 0.03 [−0.17–0.10]

25% [1–81%]

63% [50–75%]

4% [0–21%]

93% [81–99%]

2018–2019

85%

0.64 [0.39–0.89]

100% [63–100%]

82% [65–93%]

57% [29–82%]

100% [87–100%]