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Analysis of the predictive value of admission inflammatory marker levels in patients with spinal infection. (Organism identification from biopsy alone)
| Positive biopsy with raised CRP | Positive biopsy with raised WCC | |
|---|---|---|
| Sensitivity | 100% | 87.0% |
| Specificity | 67.4% | 55.3% |
| PPV | 36.4% | 58.8% |
| NPV | 100% | 84.2% |
| Likelihood ratio | 3.10 | 1.86 |
| p-value* | 0.0005 | 0.0035 |
CRP = C-reactive protein; WCC = white cell count; PPV = positive predictive value; NPV = negative predictive value
Fisher’s exact test
