PURPOSE To investigate the association between 25-hydroxyvitamin D and diabetic retinopathy (DR). METHODS A population-based cross-sectional study using a nation-wide, systemically stratified, multistage, clustered sampling method included a total of 18,363 subjects aged ≥ 40 years who participated in the Korean National Health and Nutrition Examination Survey during 2008-2012. All participan...

OBJECTIVES The study sought to determine the link between vitamin D concentrations and incident hypertension in prospective study and meta-analysis. METHODS The study was embedded in the Kailuan Study, a population-based cohort of adults that contains underground miners. In 2012, we studied 2,456 men and women free of prevalent hypertension, age 21 to 67 at baseline. Serum 25-hydroxyvitamin D...

BACKGROUND Vitamin D fortification of non-cow's milk beverages is voluntary in North America. The effect of consuming non-cow's milk beverages on serum 25-hydroxyvitamin D levels in children is unclear. We studied the association between non-cow's milk consumption and 25-hydroxyvitamin D levels in healthy preschool-aged children. We also explored whether cow's milk consumption modified this ass...

BACKGROUND This study examined the associations of 25-hydroxyvitamin D and specific host genetic variants that affect vitamin D levels or its effects on immune function, with the risk of TB or mortality in children. METHODS A case-cohort sample of 466 South African infants enrolled in P1041 trial (NCT00080119) underwent 25-hydroxyvitamin D testing by chemiluminescent immunoassay. Single nucle...

background: vitamin d deficiency is a pandemic problem mostly diagnosed in elderly. few studies are available exclusively done on the topic among young adults. specific professions such as medical students may have higher risk for developing hypovitaminosis d. we aimed to assess the vitamin d status in medical students of iran university of medical sciences; and to define a cut‑off point for 25...

BACKGROUND Epidemiological studies have shown an inverse relationship between vitamin D levels and cardiovascular diseases. However, this does not infer a causal relationship between the two. Chronic kidney disease (CKD) patients have a high prevalence of vitamin D deficiency and carotid atherosclerosis. Therefore, in this study we have aimed to determine the association between serum 25-hydrox...

BACKGROUND Studies exploring the relationship between prenatal vitamin D exposure and childhood asthma have yielded conflicting results. Higher vitamin D intake during pregnancy has been shown to lower the risk of childhood wheeze, yet a study of maternal late-pregnancy serum 25-hydroxyvitamin D suggested higher serum concentrations may be associated with increased childhood asthma. OBJECTIVE...

AIMS A causal relationship between vitamin D deficiency and the incidence of diabetes mellitus has been suggested, but little research has been conducted on the Korean population. METHODS We analysed the glucose tolerance status and serum 25-hydroxyvitamin D concentrations in 12263 subjects >19 years old who were registered for the Korea National Health and Nutrition Examination Survey, 2008-...

Increasing evidence suggests that the status of vitamin D and n-3 PUFA is associated with the risk of CVD. Major dietary sources of vitamin D include fish and fish products, which are also rich in n-3 PUFA; however, the relationship between serum 25-hydroxyvitamin D levels and tissue contents of n-3 PUFA remains unknown. The present study investigates the hypothesis that serum 25-hydroxyvitamin...

Measured serum 25-hydroxyvitamin D concentrations vary depending on the type of assay used and the specific laboratory undertaking the analysis, impairing the accurate assessment of vitamin D status. We investigated differences in serum 25-hydroxyvitamin D concentrations measured at three laboratories (laboratories A and B using an assay based on liquid chromatography-tandem mass spectrometry a...