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Effect of Prevalence on Positive Predictive Value (PPV), Negative Predictive Value (NPV), and Overall Accuracy
| Prevalence (%) | PPV (%) | NPV (%) | Accuracy (%) |
|---|---|---|---|
| 5 | 74.01a | 99.82 | 98.13 |
| 10 | 85.74 | 99.62 | 98.05 |
| 20 | 93.12 | 99.14 | 97.89 |
aAt 5% prevalence, if the sensitivity is 100%, the PPV increases to only 75%.
Calculations assume a sensitivity of 96.61% and a specificity of 98.21%.
