Body Roundness Index Versus Body Mass Index: Differential Associations With Obstructive Sleep Apnea Syndrome and All‐Cause Mortality in US Adults Aged 20 Years and Older

BRI and BMI showed comparable ability to predict OSAS risk; however, BRI demonstrated superior value in mortality stratification, emphasizing its clinical significance for assessing visceral fat-related prognosis. Because OSAS was identified using a validated questionnaire rather than polysomnography, minor classification errors may exist, warranting cautious interpretation of the findings.