2 × 2 table for diagnostic accuracy of CT spinal stenosis protocol
| MR Imaging–Positive | MR Imaging–Negative | ||
|---|---|---|---|
| CT-positive | 28 | 1 | PPV = 97% |
| CT-negative | 1 | 29 | NPV = 97% |
| Total | 29 | 30 | 59 |
| Sensitivity = 97% | Specificity = 97% |
Note:—PPV indicates positive predictive value; NPV, negative predictive value.