Characteristics of infants enrolled in the study
| Completed (n) | Withdrawn (n) | p value | |
| Number | 48 | 32 | |
| Sex (male) | 37 | 24 | 0.83 |
| Age at enrolment (days) | 221 | 234 | 0.47 |
| Eczema | 20 | 11 | 0.43 |
| Family history of: | |||
| Asthma | 41 | 23 | 0.14 |
| Eczema | 33 | 21 | 0.77 |
| Hay ever | 37 | 24 | 0.83 |
| Smoking (either parent) | 19 | 20 | 0.05 |
| Presenting symptom: | |||
| Persistent wheeze | 25 | 13 | 0.32 |
| Persistent night cough | 18 | 7 | 0.14 |
| Recurrent wheeze | 5 | 12 | 0.004 |
| Pets | 22 | 18 | 0.36 |