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Prevalence of serum 25-hydroxyvitamin D (25[OH]D) level of 30 ng/mL or more in the Third National Health and Nutrition Examination Survey (NHANES III) (1988–1994) and in NHANES 2001–2004, stratified by demographic characteristics. NH indicates non-Hispanic. To convert 25(OH)D levels to nanomoles per liter, multiply by 2.496.
