CROSSOVER TRIALS
\kɹˈɒsə͡ʊvə tɹˈa͡ɪə͡lz], \kɹˈɒsəʊvə tɹˈaɪəlz], \k_ɹ_ˈɒ_s_əʊ_v_ə t_ɹ_ˈaɪ_əl_z]\
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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)
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Word of the day
hydromorphic
- [Greek] Structurally adapted to an aquatic environment, as organs of water plants.