Real-life impact of uncontrolled severe asthma on mortality and healthcare use in adolescents and adults: findings from the retrospective, observational RESONANCE study in France.

Objective: To characterise uncontrolled severe asthma and compare the disease burden with the general and asthmatic populations.

Design: Retrospective observational study using a national sample of a French healthcare database (Echantillon Généraliste des Bénéficiaires (EGB)).

Setting: The EGB, an anonymised permanent sample of health insurance databases, representing 1/97th of the French population.