Study population and risk factors for developing post-infectious BO (bivariate analysis)
| Progressed to BO | OR | 95% CI | p value | ||
|---|---|---|---|---|---|
| Yes (n = 109) | No (n = 99) | ||||
| ETS, environmental tobacco smoke. | |||||
| Median (range) age (months) | 6 (1–26) | 5 (1–20) | |||
| <6 months | 67% | 72% | 0.5 | 0.3 to 0.9 | 0.02 |
| Male | 60% | 58% | 1.1 | 0.6 to 2 | 0.8 |
| Admitted in fall or winter | 75% | 98% | 1.0 | 0.8 to 1.2 | 0.9 |
| ETS exposure in uterus | 24% | 12% | 1.6 | 0.7 to 4 | 0.3 |
| Current ETS exposure | 59% | 38% | 2.2 | 1.2 to 4 | 0.01 |
| Adenovirus infection | 72% | 3% | 83 | 22 to 441 | <0.001 |
| Mechanical ventilation | 34% | 3% | 12 | 5 to 34 | <0.001 |