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*.
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) | ||