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Table 3 Results of applying the logistic model to both the training set and validation set using a predicted probability of 0.5 as the cutoff*.

From: Identifying individuals with virologic failure after initiating effective antiretroviral therapy: The surprising value of mean corpuscular hemoglobin in a cross-sectional study

Training Set (N = 784)
Model Classification* HIV RNA > 500 copies/ml HIV RNA ≤ 500 copies/ml  
HIV RNA > 500 copies/ml 192 57 PPV = 0.77
HIV RNA ≤ 500 copies/ml 83 452 NPV = 0.84
  Sensitivity 0.70 (95% CI: 0.64, 0.75) Specificity 0.89 (95% CI: 0.86, 0.91)  
Validation Set (N = 784)
Model Classification* HIV RNA > 500 copies/ml HIV RNA ≤ 500 copies/ml  
HIV RNA > 500 copies/ml 205 57 PPV = 0.78
HIV RNA ≤ 500 copies/ml 71 451 NPV = 0.86
  Sensitivity 0.74 (95% CI: 0.69, 0.79) Specificity 0.89 (95% CI: 0.86, 0.91)  
  1. * Individuals with probability >0.5 were classified as having HIV RNA > 500; Positive predictive value (PPV); Negative predictive value (NPV)