| Quartile of procalcitonin concentration (range, μg/L) | ||||
---|---|---|---|---|---|
 | Q1 (<1.6) | Q2 (1.6–4.1) | Q3 (4.1–14.9) | Q4 (>183) | P trend |
Crude matched pairs | Â | Â | Â | Â | Â |
   OR | 1.00 | 1.10 | 1.05 | 1.10 | 0.095 |
   95% CI | - | 0.03–0.85 | 0.25–5.87 | 2.51–59.87 |  |
   P value | - | 0.26 | 0.11 | 0.09 |  |
Adjusted for C-reactive protein | Â | Â | Â | Â | Â |
   OR | 1.0 | 1.08 | 1.10 | 1.07 | 0.123 |
   95% CI | - | 0.026–0.99 | 0.31–5.75 | 2.41–58.35 |  |
   P value | - | 0.34 | 0.10 | 0.09 |  |