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Calculation of the Sensitivity, Specificity, and Positive and Negative Predictive Values of the Diagnostic Tests
| Positive SIJ Block | Negative SIJ Block | |
|---|---|---|
| Positive physical test | A (true positive) | B (false positive) |
| Negative physical test | C (false negative) | D (true negative) |
Sensitivity = (A/(A + C)) × 100
Specificity = (D/(B + D)) × 100
Positive Predictive Value = (A/(A + B)) × 100
Negative Predictive Value = (D/(C + D)) × 100
