Methods Stiffness index(SI) of calcaneus in 1646 healthy subjects(Zhuang nationality males/females=350/441;Han nationality males/females=357/498) was measured with Achilles Express ultrasound densitometer.

• 方法采用美国Lunar公司的Ach illesExpress跟骨超声骨密度测定仪,对广西壮族自治区1 646例(壮族男/女:350/441,汉族男/女:357/498)11~61岁健康志愿者进行跟骨超声硬度指数(SI)测定。