Vertebral bone mineral density of the elderly in the urban community by mobile DXA
The present paper describes a population survey of bone mineral density (BMD) on the third lumbar vertebra (L3) using dual X-ray absorptiometry fixed in a van (mobile DXA) with lateral projection. Subjects were 387 persons aged 65 to 84 years living in Koganei City, a western suburb of Tokyo. This is the baseline survey of the 10-year project “Longitudinal Interdisciplinary Study on Aging” supported by Tokyo Metropolitan Institute of Gerontology (TMIG-LISA).
As for the pattern of age-related BMD calculated in the range-of-interest (ROI) being set in the center of vertebral body to eliminate the posterior segment of vertebra and/or secondary hyperostotic changes with aging, the mean BMD of L3 declined in females from 0.514±0.121g/cm2 (mean±standard deviation) in age-group 65–69 to 0.377±0.137 g/cm2 in age-group 80–84. In males, it showed a decrease from 0.731±0.155 in 65–69 to 0.613±0.158 in 75–79 but a slight (insignificant) increase at age-group 80–84. There were significant differences of mean BMD between males and females in each age-group and in average. BMD was significantly associated with age (negatively) and body mass index (positively) in the multiple regression analysis.
Key wordsBone mineral density Mobile DXA Community elderly Epidemiology TMIG-LISA
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