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  • Title: Low vitamin D levels in outpatient postmenopausal women from a rheumatology clinic in Madrid, Spain: their relationship with bone mineral density.
    Author: Aguado P, del Campo MT, Garcés MV, González-Casaús ML, Bernad M, Gijón-Baños J, Martín Mola E, Torrijos A, Martínez ME.
    Journal: Osteoporos Int; 2000; 11(9):739-44. PubMed ID: 11148801.
    Abstract:
    To evaluate a possible relationship between vitamin D levels and bone mineral density (BMD) and the prevalence of hypovitaminosis in a population of postmenopausal women from a rheumatologic outpatient clinic in Madrid, Spain, 171 postmenopausal women (aged 47-66 years) divided into two groups (osteoporotic and nonosteoporotic, according to WHO criteria) were studied between November and June. Liver and kidney function were normal in all subjects. Serum parathyroid hormone (PTH) and calcidiol levels were determined and bone densitometry carried out at the lumbar spine and hip level. PTH and calcidiol serum levels did not show any correlation. Serum PTH was inversely related to BMD at both hip and lumbar spine in the total group, and at the hip with calcidiol levels lower than 37 nmol/l. Calcidiol was directly related to hip BMD only when levels were lower than 37 nmol/l. Results of a stepwise multiple regression analysis showed that the single factor which affected BMD at the hip was calcidiol in the subgroup with serum calcidiol levels below 37 nmol/l, while in the subgroup with serum calcidiol levels above 37 nmol/l, the main factor affecting hip BMD was serum PTH. The prevalence of vitamin D deficiency at a cutoff of 37 nmol/l was 64%. In summary, calcidiol serum levels below 37 nmol/l seem to affect bone mass, regardless of the effect of PTH. Vitamin D deficiency is a frequent finding in the postmenopausal women who attend a rheumatology outpatient clinic in Madrid. Vitamin D supplementation should therefore be considered in this population during the winter season.
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