Presence of white blood cell count >15.4 × 109/l or serum sodium concentration <135 mmol/l, or both, to predict early stage necrotising fasciitis*
| Sample | Sensitivity (95% CI) | Specificity (CI) | +LR | −LR |
|---|---|---|---|---|
| *LRs defined in glossary and calculated from data in article. | ||||
| Derivation | 95% (76 to 100) | 95% (76 to 100) | 20 | 0.05 |
| Validation | 90% (74 to 98) | 76% (71 to 80) | 3.7 | 0.13 |