Table 3.
Factors associated with a request for chest X-rays in infants hospitalized for bronchiolitis.
| Clinical Characteristics | Chest X-ray Performed N = 1109 |
Chest X-ray not Performed N = 605 |
p-Value | OR (95% CI) |
|---|---|---|---|---|
| Sex, male | 610 (55%) | 373 (62%) | 0.006 | 0.8 (0.6 to 0.9) |
| Age (months) * | 6.3 ± 7.5 | 4.0 ± 4.3 | <0.001 | |
| Age > 6 months | 428 (39%) | 121 (20%) | <0.001 | 2.5 (2.0 to 3.2) |
| Fever > 38 °C | 679 (61%) | 186 (31%) | <0.001 | 3.5 (2.9 to 4.4) |
| Duration of fever (days) * | 2.9 ± 2.3 | 1.9 ± 1.5 | <0.001 | |
| Hypoxia | 815 (74%) | 338 (56%) | <0.001 | 2.1 (1.7 to 2.6) |
| Duration of hypoxia (days) * | 3.5 ± 2.8 | 2.6 ± 1.7 | 0.001 | |
| Length of hospital stay (days) * | 5.2 ±3.2 | 3.6 ± 2. | <0.001 | |
| PICU admission | 62 (6%) | 5 (0.9%) | < 0.001 | 6.8 (2.7 to 16.9) |
| Adenovirus infection | 96 (9%) | 32 (5%) | <0.001 | 2.3 (1.5 to 3.6) |
| Human bocavirus infection | 82 (8%) | 16 (3%) | <0.001 | 2.9 (1.7 to 5.1) |
| Parainfluenza virus infection | 52 (5%) | 49 (8%) | 0.005 | 0.6 (0.4 to 0.8) |
| Leucocytes (cells/mm3) * | 13,827 ± 10176 | 11,386 ± 4437 | <0.001 | |
| Serum C reactive protein (mg/L) * | 28.7 ± 40.7 | 14.6 ± 19.5 | <0.001 |
* mean ± standard deviation. PICU: pediatric intensive care unit.