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Validity of a four-fold increase of PCT value between day 1 (PCT1: day of fever onset) and the six previews days (PCT0 to PCT-5) for differentiating patients with and without proven infection
| Sensitivity | Specificity | PPV | |
|---|---|---|---|
| PCT1-PCT0 | 59.26 | 86.95 | 84.20 |
| PCT1-PCT(-1) | 64 | 82.60 | 80 |
| PCT1-PCT(-2) | 68 | 77.27 | 77.27 |
| PCT1-PCT (-3) | 69.56 | 76.17 | 69.65 |
| PCT1-PCT(-4) | 66.67 | 80 | 77.77 |
| PCT1-PCT(-5) | 66.67 | 73.68 | 73.68 |
PPV: Positive Predictive Value, PCT: Procalcitonin
