Diagnostic value of variables described in >1 study for the diagnosis of appendicitis in patients with suspected appendicitis*
| Variables | Number of patients | Number of patients with appendicitis | Pooled area under the ROC curve (95% CI) |
|---|---|---|---|
| *ROC = receiver operating characteristic; CI defined in glossary. | |||
| Granulocyte count | 628 | 254 | 0.78 (0.75 to 0.82) |
| White blood cell count | 3382 | 1288 | 0.77 (0.75 to 0.78) |
| Proportion of polymorphonuclear cells | 1067 | 427 | 0.77 (0.70 to 0.84) |
| C reactive protein concentration | 1360 | 529 | 0.75 (0.66 to 0.85) |
| Rebound peritoneal irritation | 3439 | 1287 | 0.70 (0.65 to 0.75) |
| Peritoneal percussion tenderness | 211 | 99 | 0.70 (0.63 to 0.78) |
| History of migration of pain | 2459 | 912 | 0.68 (0.63 to 0.74) |