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1·The Risser sign was measured according to both the United States and European grading systems. Digital skeletal age was calculated, and triradiate cartilage ossification was assessed.

根据美国和欧洲的分级系统测量标志的里塞尔，计算数字骨龄，评估软骨骨化。

2·A new system with three groups was tested, and the second group (Risser 0 with closed triradiate cartilage and Risser 1) was the best predictor of a digital skeletal age score of between 400 and 425.

一个新的系统分三组进行了测试，第二组(里塞尔0与封闭三叶形软骨和里塞尔1)能够最佳预测400至425之间的数字骨龄评分。