retrospectively analysised these first x-ray-film of left hand and wrist in first visit, single-blind analysis by TW met回顾性分析初诊时第一张左手腕X光片，用TW_法盲法分期，骨龄结果分 骨骨龄、7骨骨龄和0骨骨龄 个系统，每个系统分个工作点即＞P97、＞P90、 ＞P7、＞P0和≤P0。