Criterion Standard: Two Positive Blocks Control Block

Initial Block

293

Positive

Negative

Positive

271

237

34

Negative

22

4

18

Analysis Outcomes

Sensitivity

98.3% (95% CI: 95.80% - 99.54%)

Specificity

34.6% (95% CI: 21.97% - 49.09%)

Proportion of Confirmed Positive Diagnoses

87.5%

Proportion of False Positive Diagnoses

12.5%

Proportion of Confirmed Negative Diagnoses

81.8%

Proportion of False Negative Diagnoses

18.2%

Positive Predictive Value

80.9%

Negative Predictive Value

81.8%

Overall Accuracy

87.03%