The study used a "cross-over" design, which allowed each subject to serve as his or her own comparison group.
这个研究试验采用了交叉设计，这样每一个研究对象的对照组就是他（她）自己。
Two parallel group trials found no significant difference in machine usage, whereas a cross-over study found a significant difference.
两项平行组别试验未发现机器使用有意义的差异，然而，一项交叉试验显示有意义的差异。
Method Cross-sectional investigation was applied to study 1941 elderly aged 60 or over years of age with questionnaire of elderly comprehensive health function.
方法对上海市天平街道1941名60岁以上社区老年人的健康状况进行描述性分析。
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