Table 3.
Positive Predictive Values (PPV) and Negative Predictive Values (NPV) across a range of influenza prevalence using the Sensitivity (84 %) and Specificity (48 %) of the diagnostic model based on CART analyses
| Prevalencea | PPV, % | NPV, % | |
|---|---|---|---|
| Hypothetical ranges of influenza prevalence | 1.0 | 1.61 | 99.7 |
| 10.0 | 15.2 | 96.4 | |
| 15.0 | 22.2 | 94.4 | |
| 20.0 | 28.8 | 92.3 | |
| 25.0 | 35.0 | 90.0 | |
| 30.0 | 40.9 | 87.5 | |
| 35.0 | 46.5 | 84.8 | |
| 40.0 | 51.9 | 81.8 | |
| 2011–2012 influenza prevalence in US Influenza Vaccine Effectiveness Network | 15.4 | 22.7 | 94.3 |
Note: CART classification and regression trees
aPer one hundred