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The sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) of the 2 diagnostic arms of Gram staining
| Diagnostic arm | Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) |
|---|---|---|---|---|
| THA | ||||
| Presence of organisms | 31 (23–38) | 100 (99–100) | 100 (92–100) | 79 (76–83) |
| Presence of “many” PMNs | 31 (24–39) | 99 (97–99) | 89 (80–97) | 79 (75–83) |
| TKA | ||||
| Presence of organisms | 30 (24–37) | 100 (99–100) | 98 (94–100) | 70 (66–75) |
| Presence of “many” PMNs | 53 (46–61) | 99 (97–99) | 96 (92–99) | 78 (73–82) |
