Cost-related medication nonadherence in adults with COPD in the United States 2013–2020

Cost-related medication nonadherence (CRN) is associated with poor prognosis among patients with chronic obstructive pulmonary disease (COPD), a population that requires long-term treatment for secondary prevention. In this study, we aimed to estimate the prevalence and sociodemographic characteristics of CRN in individuals with COPD in the US. In a nationally representative survey of US adults in the National Health Interview Survey (2013–2020), we identified individuals aged ≥18 years with a self-reported history of COPD. Cross-sectional study. Of the 15,928 surveyed individuals, a weighted 18.56