Weighted comparison of baseline characteristics.

BackgroundThe relationship between body roundness index (BRI) and low muscle mass (LMM) remains unclear. This study investigated their association in American adults under 60 years.MethodsThis secondary analysis utilized de-identified data from the National Health and Nutrition Examination Survey (NHANES, 2011–2018; n = 8,065 adults ResultsEach 1-unit BRI increase elevated LMM risk by 73% (OR=1.73, 95%CI = 1.61–1.86, p p value ConclusionHigher BRI may increase the risk of LMM in individuals under 60 years old among Americans, especially in men. BRI may serve as a supplementary indicator for identifying individuals at risk of LMM.