Red cell distribution width-to-albumin ratio and hypertension risk: age-specific threshold effects identified in the 2017–2020 NHANES U.S. Adult population

This study confirmed a linear positive correlation between red blood cell distribution width and albumin ratio (RAR) and the prevalence of hypertension, RAR ≥ 3.4 was associated with higher hypertension prevalence and may help identify high-risk subgroups, particularly among diabetics, but its predictive value warrants validation through prospective cohort studies.