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| IRR | CI 95% | p | |
|---|---|---|---|
| Age <6 months | 0.998 | 0.9-0.9 | 0.000 |
| Comorbidities (CHD or neurological) | 2.119 | 1.4-3.0 | 0.000 |
| Chest indrawing | 1.322 | 1.1-1.5 | 0.001 |
| BPD | 1.610 | 1.0-2.3 | 0.017 |
| RSV positive | 1.593 | 1.3-1.8 | 0.000 |
| Increased C-reactive protein (> 40 mg/lit.) | 1.005 | 1.0-1.0 | 0.006 |
