Methods An ultrasound bone sonometer, Omnisense (Sunlight Medical Ltd, Israel), was used to measure the bone speed of sound (SOS) of tibia in 157 Shanghai infants, and then compared with those of Caucasian.

• 方法采用以色列Sunlight公司生产的Omnisense定量超声仪,对157例新生儿进行胫骨声波速度(speed of sound,SOS)测量并与白人婴儿比较。