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American Journal of Clinical Nutrition, Vol 46, 1005-1010, Copyright © 1987 by The American Society for Clinical Nutrition, Inc
ORIGINAL RESEARCH COMMUNICATIONS |
P Lips, FC van Ginkel, MJ Jongen, F Rubertus, WJ van der Vijgh and JC Netelenbos
Department of Internal Medicine, Academisch Ziekenhuis Vrije Universiteit, Amsterdam, the Netherlands.
The factors that influence vitamin D status were investigated in 125 patients with hip fracture and in 74 elderly control subjects. The serum concentrations of 25-hydroxyvitamin D [25(OH)D] varied with sunshine score and were paralleled by serum 1,25-dihydroxyvitamin D [1,25(OH)2D]. The control subjects showed a higher sunshine score and higher serum 24(OH)D levels than the patients with hip fracture. Dietary vitamin D intake was similar in both groups (mean 115 IU/d). A positive correlation between vitamin D intake and serum 25(OH)D was observed in the patients with low sunshine exposure. It appeared from this relation that dietary vitamin D intake should be approximately 300 IU/d to maintain an adequate serum (25(OH)D concentration. Vitamin D status was very poor in patients who were institutionalized before hip fracture. Multiple regression analysis on serum 25(OH)D confirmed the primary role of sunshine exposure as determinant of vitamin D status. The principal determinants of serum 1,25(OH)2D were serum 25(OH)D, serum creatinine, and serum phosphate.
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