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KMID : 0384319990200091099
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Korean Journal of Family Medicine
1999 Volume.20 No. 9 p.1099 ~ p.1105
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Normal bone mineral density of Korean women according to age: using cross-calibration equation among several dual energy X-ray absorptiometries
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Cheong Yoo-Seock
Lee Young-Sung
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Abstract
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Background : The lack of standardization in measuring bone mineral density(BMD) is generally recognized as an important and unresolved issue. The National Health Insurance System in Korea covers the cost of osteoporosis treatment according to the relative value(T score < -1.0) of normal BMD. Considering this issue, we are concerned
about whether Korean women have a normal value of BMD. We analyzed numerous research papers published in Korea which related to BMD, and calculated the normal BMD of Korean women using cross-calibration equipment on three different DEXA scanners(Lunar/Norland/Hologic).
Methods : We searched for key words such as ‘osteoporosis’ and ‘bone mineral density’ in the Korean Medical Journal CD-ROM form 1987 to 1997. We received 145 full tests, and analyzed 114 original articles all of which used one of the above three scanners, over 100 normal Korean women as subjects and focused on the lumbar spine.
We found five articles that fit the criteria. Among the scanners used in the five articles are three were Lunar, one Hologic and one Norland. We substituted the results of Norland and Hologic with Lunar’s using a cross-calibration equation, and calculated the mean BMD according to age by using a weighted average. Standard deviations of the calibrated data were calculated by using pooled estimates of variance equation.
Results : The lumbar spine BMD values of normal Korean women were 1.181± 0.683(g/㎠) in their thirties. forties, fifties, sixties were 1.128±0.144, 0.989±0.161, 0.862± 0.162, respectively in Lunar scanner, 1.020±0.586, 0.974±0.124, 0.854±0.138, 0.746±0.139, respectively in Norland seanner.
Conclusions : We calculated the lumbar spine BMD values for normal Korean women among three major companies using DEXA scanners. Further studies on BMD in randomly selected healthy adult women are needed.
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KEYWORD
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bone mineral density, osteoporosis, standardization, normal value,
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