年龄因素对中老年妇女髋部双能X线骨密度仪测量精确性的影响

目的评估年龄因素对双能X线骨密度仪(DXA)测量中老年妇女髋部骨密度(BMD)精确性的影响.方法随机选取90例中老年妇女,分为45～55岁、56～65岁、66～75岁组3组,每组30人.所有受试者均在同一天内完成2次右髋部DXA测量,计算每位受试者的离散度,再算出各组的平均骨密度和标准差,采用方差分析,对各组的标准差进行比较.结果不同年龄组股骨颈和股骨大粗隆的平均骨密度随年龄增长呈下降趋势,各组标准差之间的差异性比较均有显著性(P＜0.05);不同年龄组Ward三角区的平均骨密度亦随年龄增长呈下降趋势,除45～55岁与56～65岁年龄组标准差间的差异无显著性(P＞0.05),其他各组标准差之间的差异均有显著性(P＜0.05).结论年龄因素对中老年妇女DXA测量的精确性有一定影响.

Effect of age on the precision of dual X-ray absorptiometry measurement in middle-aged and elderly women

Objective To investigate whether age influence the precision of dual X-ray absorptio-metry(DXA)measurement at the hip in middle-aged and elderly women. Methods Totally 90 womenwere randomly selected and divided into three age groups:45-55 years, 56-65 years, and 66-75 years. Each age group contained 30 women. Each woman was scanned twice at the same day. Bone mineral density(BMD)values of femoral neck, ward's triangle, and trochanter were collected and grouped by calculating the root mean square(RMS). Precision errors were expressed as RMS(standard deviation, SD). Results For the femoral neck and trochanter, significant differences of SD of BMD existed among all age groups. For the ward's triangle, significant difference of BMD existed among all age groups except between the 45-55 group and 56-65 age group. Conclusion Age can influence the precision of DXA measurement at the hip in middle-aged and elderly women.