AUTHOR=Liu Yu , Fan Zheng , Ren Hongmei , Zheng Cuixia TITLE=Association of the non-high-density lipoprotein cholesterol to high-density lipoprotein cholesterol ratio (NHHR) with COPD prevalence and all-cause mortality: a population-based study based on NHANES 2007–2016 JOURNAL=Frontiers in Medicine VOLUME=12 YEAR=2025 URL=https://www.frontiersin.org/journals/medicine/articles/10.3389/fmed.2025.1533744 DOI=10.3389/fmed.2025.1533744 ISSN=2296-858X