| Measure | Value |
|---|
How the model works: of 200 people, prevalence × 200 have the condition (solid dots). Sensitivity × that number test positive (true positives); the rest are false negatives. Specificity × the people without the condition test negative (true negatives); the rest are false positives (rings in the positive row). PPV = TP ÷ (TP + FP), NPV = TN ÷ (TN + FN), LR+ = sensitivity ÷ (1 − specificity), LR− = (1 − sensitivity) ÷ specificity. The curves show PPV and NPV across prevalence for the current test.
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Fictional adults and simplified findings. For learning only, not medical advice.
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