Application of Multicategory Exposure Marginal Structural Models to Investigate the Association between Long-Acting Beta-Agonists and Prescribing of Oral Corticosteroids for Asthma Exacerbations in the Clinical Practice Research Datalink

In concordance with current asthma management guidelines, inhaled LABAs should not be prescribed as monotherapy to patients with asthma. The findings suggest the presence of time-dependent confounding by asthma severity, which was accounted for by the marginal structural model.