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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

From: Classification and Regression Tree (CART) analysis to predict influenza in primary care patients

  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
  1. Note: CART classification and regression trees
  2. aPer one hundred