Conclusion
In a representative sample of adults who had ever had asthma, four clinically relevant asthma phenotypes can be seen, which could be distinguished on the basis of age at asthma onset, level of severity, and other characterization, including demographics, risk factors, triggers, lung function, respiratory symptom profiles, and inflammation markers. The derived asthma phenotypes provide a novel setting for catalyzing important asthma research that will include detailed profiling of the immunological aspects of the phenotypes, modelling putative risk factors, characterizing their comorbidity profiles, and assessing future clinical outcomes and societal burden of each asthma phenotype.