Table 4.
PCR index and grading system.
| Predictor | Value | Score | |||
|---|---|---|---|---|---|
| PaO2/FiO2 ratio (P) | < 250 | 1 | |||
| 250 | 0 | ||||
| CRP (C) | 5.5 | 1 | |||
| < 5.5 | 0 | ||||
| HRCT pattern (R) | Diffuse | 1 | |||
| Non-diffuse | 0 |
| Total score of PCR index | Measured value (n = 103) | 3-Month mortality estimated by bootstrap method | 95% CI | ||
|---|---|---|---|---|---|
| No. of patients | 3-month mortality | Lower | Upper | ||
| Total possible points 3 | |||||
| 0 | n = 13 | 0.077 (7.7%) | 0.083 (8.3%) | 0.072 | 0.081 |
| 1 | n = 34 | 0.294 (29.4%) | 0.291 (29.1%) | 0.291 | 0.300 |
| 2 | n = 31 | 0.548 (54.8%) | 0.554 (55.4%) | 0.564 | 0.576 |
| 3 | n = 25 | 0.800 (80.0%) | 0.803 (80.3%) | 0.798 | 0.808 |
CI, confidence interval; HRCT, high-resolution computed tomography; CRP, C-reactive protein.