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Healthy elderly French women living at home have secondary hyperparathyroidism and high bone turnover in winter. EPIDOS Study Group. Chapuy MC, Schott AM, Garnero P, Hans D, Delmas PD, Meunier PJ. J Clin Endocrinol Metab. 1996 Mar;81(3):1129-33. PMID: 8772587 These results show that vitamin D status of a French aged population in good health and living at home depends mainly on lifestyle. Like institutionalized women, old women living at home exhibit clear evidence of senile hyperparathyroidism in the winter, secondary in part to a reduced 25OHD level and associated with biological signs of increased bone turnover. The maintenance of PTH within the normal range for healthy adults by vitamin D and calcium treatment might constitute an approach for the prevention of bone loss in the entire

Vitamin D3 and calcium to prevent hip fractures in the elderly women. Chapuy MC, Arlot ME, Duboeuf F, Brun J, Crouzet B, Arnaud S, Delmas PD, Meunier PJ. N Engl J Med. 1992 Dec 3;327(23):1637-42. PMID: 1331788 CONCLUSIONS. Supplementation with vitamin D3 and calcium reduces the risk of hip fractures and other nonvertebral fractures among elderly women.

Vitamin D3 and calcium to prevent hip fractures in the elderly women. Chapuy MC, Arlot ME, Duboeuf F, Brun J, Crouzet B, Arnaud S, Delmas PD, Meunier PJ. N Engl J Med. 1992 Dec 3;327(23):1637-42. PMID: 1331788 CONCLUSIONS. Supplementation with vitamin D3 and calcium reduces the risk of hip fractures and other nonvertebral fractures among elderly women.

An international comparison of serum 25-hydroxyvitamin D measurements. Lips P, Chapuy MC, Dawson-Hughes B, Pols HA, Holick MF. Osteoporos Int. 1999;9(5):394-7. PMID: 10550457 DOI: 10.1007/s001980050162 The results show that 25(OH)D values from different laboratories can not be assumed to be comparable unless a careful cross-calibration has been performed.

Prevalence of vitamin D insufficiency in an adult normal population. Chapuy MC, Preziosi P, Maamer M, Arnaud S, Galan P, Hercberg S, Meunier PJ. Osteoporos Int. 1997;7(5):439-43. PMID: 9425501