Risk ratio (RR) of later admission with wheeze by aetiology and length of bronchiolitis admission
| Length of admission (days) | 0 | 1–>3 | 4–>6 | 7 to 13 | >14 | Combined |
| All bronchiolitis RR (95% CI) | 2.16 (1.9 to 2.5) | 2.37 (2.1 to 2.7) | 2.57 (2.3 to 2.9) | 3.37 (2.9 to 3.9) | 3.24 (2.4 to 4.3) | 2.4 (2.2 to 2.8) |
| RSV RR (95% CI) | 1.6 (1.2 to 2.2) | 2.0 (1.7 to 2.4) | 2.3 (1.7 to 2.4) | 3.1 (2.6 to 3.7) | 2.9 (1.8 to 4.2) | 2.3 (2.0 to 2.6) |
| nRSV RR (95% CI) | 2.5 (0.8 to 5.2) | 1.5 (0.7 to 2.6) | 3.5 2.3 to 4.9) | 5 (3.3 to 7.0) | 3.6 (1.4 to 6.6) | 3.1 (2.4 to 4.0) |
| usBr RR (95% CI) | 2.2 (1.9 to 2.5) | 2.52 (2.2 to 2.8) | 2.7 (2.4 to 3.1) | 3.5 (2.9 to 4.3) | 3.7 (2.3 to 5.5) | 2.5 (2.2 to 2.8) |
nRSV, non-respiratory syncytial virus; usBr, unspecified bronchiolitis.