Frequencies of respiratory health outcomes according to the follow-up period
| Outcome | 6 months (672) n (%) | 15 months (636) n (%) | 4 years (544) n (%) | 7 years (486) n (%) |
|---|---|---|---|---|
| Doctor-diagnosed asthma (prevalence) | 24 (3.6) | 28 (4.4) | 27 (5.0) | 34 (7.0) |
| Doctor-diagnosed asthma (incidence)* | 24 (3.6) | 24 (3.9) | 17 (3.5) | 22 (5.4) |
| Wheezing | 123 (18.3) | 184 (28.9) | 89 (16.4) | 45 (9.3) |
| Shortness of breath with wheezing | 74 (11.0) | 118 (18.6) | 65 (11.9) | 15 (3.1) |
| Cough or phlegm apart from cold | 91 (13.5) | 143 (22.5) | 105 (19.3) | 52 (10.7) |
| Otitis | 46 (6.8) | 124 (19.5) | 164 (30.1) | – |
| Lower respiratory infections† | 75 (11.2) | 122 (19.2) | 63 (11.6) | – |
*New cases between two follow-ups.
†Includes bronchitis, bronchiolitis and pneumonia. At 6 and 15 months, information was collected with a questionnaire; at 4 years we obtained this information from pneumologist visits and emergency room visits with diagnoses of bronchitis, bronchiolitis or pneumonia.