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  • Title: Determinants of vitamin D levels in nursing home residents.
    Author: Drinka PJ, Krause PF, Nest LJ, Goodman BM.
    Journal: J Am Med Dir Assoc; 2007 Feb; 8(2):76-9. PubMed ID: 17289535.
    Abstract:
    OBJECTIVE: To determine the effect of various doses of vitamin D(2) and D(3), as well as ambulatory status (a surrogate for sun exposure), on 25-OH-D levels. DESIGN: Cross-sectional study with multiple regression analysis. SETTING: A state veterans home for veterans and their spouses. PARTICIPANTS: Three hundred two of 609 eligible residents. MEASUREMENTS: Serum 25-OH-D and parathyroid hormone (PTH) level, supplemental dose of vitamins D(2) and D(3) per kilogram of body weight, and 3 levels of ambulatory status. RESULTS: The mean 25-OH-D level was 28.6 + 9.2 ng/mL; 6.6% of subjects had values of 16 ng/mL or below. Thirty-two percent of participants had 25-OH-D levels below 30 ng/mL and PTH elevation based on stage of kidney disease, evidence that the suboptimal 25-OH-D level had physiologic consequences. Residents unable to transfer independently had 25-OH-D levels 1.6 ng/mL lower than those able to transfer independently. A regression analysis performed in residents unable to transfer independently (less likely to be exposed to the sun) demonstrated that the average increase in 25-OH-D level per 100 IU of D(3) in a 70-kg resident was 2.1 ng/mL versus 1.8 ng/mL for vitamin D(2). CONCLUSION: Nursing home residents should receive at least 800-1000 IU of D(3) per day in an effort to maintain optimal vitamin D levels.
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