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Journal of Clinical Endocrinology & Metabolism, Vol 74, 20-23, Copyright © 1992 by Endocrine Society

ARTICLES

Relative contributions of years since menopause, age, and weight to vertebral density in postmenopausal women

BE Nordin, AG Need, A Bridges and M Horowitz
Division of Clinical Chemistry, Institute of Medical and Veterinary Science, Adelaide, South Australia.

Vertebral mineral density (VMD) was measured by quantitative computerized tomography (QCT) in 16 premenopausal and 243 untreated postmenopausal women without vertebral compression. The mean VMD in the premenopausal group was 157 +/- 10.1 mg/mL, which is close to previously reported values. In the postmenopausal women, VMD fell significantly with age and years since menopause (YSM) separately and together, but the relation to YSM was more significant than that to age. After logarithmic transformation of YSM, the fall in bone density with logYSM was highly significant (P less than 0.001), and that with age was not quite significant. In 36 pairs of women matched for YSM, there was no significant difference in VMD between the subjects up to and over 55 yr of age. In 32 pairs matched for age, VMD was significantly lower in those over 55 yr than in those up to 55 yr (P = 0.005). There was also a significant correlation between VMD and body weight. After this was allowed for, the correlation between VMD and logYSM remained highly significant, but the correlation with age was not significant. We conclude that the fall in vertebral body trabecular bone in postmenopausal women is self-limiting, amounts to about 35% bone loss in 25 yr (most of it in the first 5 yr), and corresponds to but is proportionately greater than the trabecular component in postmenopausal forearm bone loss.


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