Figure 1.

Patient perceptions of asthma control and symptom frequency. Percentages of all patients in three UK studies [17,24,25] who considered their asthma to be controlled or well controlled and percentages of patients in those three studies who were experiencing asthma symptoms or using a rescue β₂-agonist. *In the UK Asthma treatment needs study, symptoms were reported ≥3 times per week. **For the UK pediatric Asthma In Real Life (AIR) study, the symptom reported is difficulty breathing. †For the UK pediatric AIR study, the β₂-agonist use reported is two or more times per day. ‡For the UK pediatric AIR study, the β₂-agonist use reported is one or more times per day.