Concentrations of Serum Vitamin D and the Metabolic Syndrome Among U.S. Adults

Abstract
Between 1988 and 1994, a representative sample of the noninstitutionalized civilian U.S. population, selected using a multistage stratified sampling design, participated in the NHANES III (Third National Health and Nutrition Examination Survey). Survey participants were interviewed and invited for a clinical examination (12,13,14).