《英文msh詞典》Design,Cross-Over
[入口詞] Design,Cross-Over
[主題詞] Cross-Over Studies
[英文釋義] Studies comparing two or more treatments or interventions in which the subjects or patients,upon completion of the course of one treatment,are switched to another. In the case of two treatments,A and B,half the subjects are randomly allocated to receive these in the order A,B and half to receive them in the order B,A. A criticism of this design is that effects of the first treatment may carry over into the period when the second is given. (Last,A Dictionary of Epidemiology,2d ed)