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Weighted diagnostic index scores for clinical variables used for diagnostic rule.
| Clinical variables | Diagnostic index |
|---|---|
| Duration of illness (days) | |
| >5.5 | 4 |
| ≤5.5 | 0 |
| Duration of coughing (weeks) | |
| ≥2 | 4 |
| <2 | 0 |
| Blood sodium (mmol/L) | |
| >137.5 | −4 |
| ≤137.5 | 0 |
| CSF % neutrophils | |
| >72.5 | −5 |
| ≤72.5 | 0 |
