JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Low levels of 25-hydroxy vitamin D and active 1,25-dihydroxyvitamin D independently associated with type 2 diabetes mellitus in older Australian men: the Concord Health and Ageing in Men Project.

OBJECTIVES: To examine the associations between serum 25-hydroxyvitamin D (25OHD) levels and the active vitamin D metabolite, 1,25-hydroxyvitamin D (1,25OHD), with type 2 diabetes mellitus (DM) in community-living men aged 70 and older.

DESIGN: Cross-sectional.

SETTING: A population-based, cross-sectional analysis of the baseline phase of the Concord Health and Ageing in Men Project (CHAMP), a large epidemiological study conducted in Sydney between January 2005 and May 2007.

PARTICIPANTS: Community dwelling men aged 70 and older taking part in CHAMP (N = 1,659).

MEASUREMENTS: Serum 25OHD and 1,25OHD levels, presence of DM, age, country of birth, season of blood collection, sun exposure, body mass index, vitamin D supplement use, statin use, income, measures of health, depression, activity of daily living disabilities, parathyroid hormone, estimated glomerular filtration rate, phosphate, and calcium.

RESULTS: The prevalence of DM was 20.0%. There was a significant association between low 25OHD and 1,25OHD levels and DM that remained after adjustment for a wide range of confounders and covariates of clinical significance such as comorbidity, renal function, calciotropic hormones, and medications.

CONCLUSION: 25OHD and 1,25OHD levels were associated with DM. The independent association between serum 25OHD and 1,25OHD concentrations and DM raises the question of whether each of the two vitamin D metabolites may influence DM through different biological mechanisms and pathways.

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