Figure 2From: Prevalence of asthma in Portugal - The Portuguese National Asthma SurveyCurrent asthma prevalence in subgroups of adults by symptoms possible to affect the estimates. Symbols represent the prevalence of ‘Current asthma’ in people: ♦ without chronic bronchitis; ▲who smoked ≤10 packs-year; ■ without self reported heart disease and ● all participants of the age group.Back to article page