Recruitment took place at 15 hospitals across Scotland and primary care. Inclusion criteria were:

1. Asthma diagnosed by a consultant paediatrician with a special interest in asthma/tertiary respiratory paediatrician and the child is aged 2-16 years OR asthma diagnosed by a primary care physician and the child is aged 5-16 years.
2. Absence of other serious respiratory condition, e.g. cystic fibrosis
3. Absence of gastrooesophageal reflux requiring treatment.
4. Absence of neurological condition eg cerebral palsy