An in-depth study upon the changing characteristics and factors of SOS value is of great significance in establishing a domestic Ultrasonic BonAge develop-ment criteria system.

• 超声骨龄测试法在我国尚处于起步推广阶段,深入研究测试结果中的SOS值的变化特征及影响因素,对建立起我国的超声骨龄发育标准体系有着重要的参考意义。