1. Aged: 6-80 years

2. Evidence of active asthma (diagnostic code and/or ≥6 prescriptions for asthma therapy at any time in their records)

3. Evidence of current asthma treatment (≥2 asthma prescriptions during baseline year and outcome year)

4. Have at least one year of up-to-standard (UTS) baseline data and at least one year of UTS outcome data (following the IPD)

Exhaled Nitric Oxide in Asthma Management