Example of contingency table from a study evaluating the accuracy of pain over speed bumps for diagnosis of appendicitis (adapted from Ashdown et al,95 with permission)
| Appendicitis | |||
|---|---|---|---|
| Pain over speed bumps | Positive | Negative | Total |
| Positive | 33 | 21 | 54 |
| Negative | 1 | 9 | 10 |
| Total | 34 | 30 | 64 |