The most important requirment for analysis and interpretation of the crossover design is that there is no carry-over effect from the first treatment to the second.
应用交叉设计进行治疗试验的关键在于，第二期治疗时，先用药物的残余效应已不存在。
The most important requirment for analysis and interpretation of the crossover design is that there is no carry-over effect from the first treatment to the second.
应用交叉设计进行治疗试验的关键在于，第二期治疗时，先用药物的残余效应已不存在。
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