Association between Vitamin D Deficiency, Obesity, and Menstrual Irregularities among Women of Reproductive Age: A Cross-Sectional Analysis of NHANES Data
Background: Menstrual irregularities can reflect metabolic and endocrine dysfunction, yet the independent roles of vitamin D deficiency and obesity remain uncertain. This study examined their separate and joint associations with a severe menstrual-irregularity phenotype among U.S. women of reproductive age.Methods: A c...