title: Normal changes in spinal bone mineral density in a Chinese population: assessment by quantitative computed tomography and dual-energy X-ray absorptiometry.
abstract: This study was designed to determine age- and gender-based normative values for spinal bone mineral density (BMD) in a Chinese population. In addition, we compared our data with those of other countries and populations. Four hundred and forty-three healthy Chinese subjects, aged 10-79 years (189 males, mean age 46.9 years; 254 females, mean age 45.7 years) were recruited for BMD assessment. BMD was measured by quantitative computed tomography (QCT) and dual-energy X-ray absorptiometry (DXA), including posteroanterior DXA (PA-DXA), lateral DXA (L-DXA) and midlateral DXA (mL-DXA). For both genders, BMD values peaked in the 10-19 year age group when measured by QCT, and in the 30-39 year age group when measured by PA-DXA. BMD values decreased with age after reaching peak bone density in males and females for all measurements, except for PA-DXA in males. Male BMD values by DXA tended to increase beginning with the 60-69 age group through the 70-79 age group whether by PA-DXA, or L-DXA and mL-DXA. However, male QCT data showed stable BMD values among these two older groups. Comparative results showed female QCT data were higher in the 20-39 age group and lower after the 40-49 age group compared with American females. The peak BMD value by PA-DXA in Chinese females was reached in the same age group as American and European females and was similar in magnitude (p > 0.05). However, the peak BMD value for Chinese females was reached earlier and was significantly higher than that observed in Japanese females (p < 0.001). We conclude that the age group in which the peak BMD values are reached is different depending on the technique used, as is the calculated age-related rate of bone loss. It can be speculated that such differences reflect different timing for bone maturation in cancellous and cortical bone.
authors.affiliation: Department of Radiology, Peking Union Medical College Hospital, Beijing, China.
authors.forename: W
authors.initials: W
authors.lastname: Yu
authors.forename: M
authors.initials: M
authors.lastname: Qin
authors.forename: L
authors.initials: L
authors.lastname: Xu
authors.forename: C
authors.initials: C
authors.lastname: van Kuijk
authors.forename: X
authors.initials: X
authors.lastname: Meng
authors.forename: X
authors.initials: X
authors.lastname: Xing
authors.forename: J
authors.initials: J
authors.lastname: Cao
authors.forename: H K
authors.initials: HK
authors.lastname: Genant
mesh_terms: D015502:Absorptiometry, Photon; D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D015519:Bone Density; D002648:Child; D002681:China; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012016:Reference Values; D012044:Regression Analysis; D012737:Sex Factors; D013131:Spine / Q000000981:diagnostic imaging / Q000502:physiology*; D014057:Tomography, X-Ray Computed