BMD of middle phalanges of the index, middle and ring fingers (MP2, MP3, MP4)in the non-dominant hand were measured by RA (Compumed, Inc, U. S. A. , OsteoGram-2000) . They were divided into 10-year groups of each for analysis.

• 用美国CompuMed公司OsteoGram-2000骨密度仪测定所有对象非优势手的第2、3、4指中节指骨(MP2、MP3、MP4)的BMD值,按10岁一个年龄组进行统计分析。