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• W2955169092 abstract "“N-of-1,” or single subject, clinical trials seek to determine if an intervention strategy is more efficacious for an individual than an alternative based on an objective, empirical, and controlled study. The design of such trials is typically rooted in a simple crossover strategy with multiple intervention response evaluation periods. The effect of serial correlation between measurements, the number of evaluation periods, the use of washout periods, heteroscedasticity (i.e., unequal variances among responses to the interventions) and intervention-associated carry-over phenomena on the power of such studies is crucially important for putting the yield and feasibility of N-of-1 trial designs into context. We evaluated the effect of these phenomena on the power of different designs for N-of-1 trials using analytical theory based on standard likelihood principles assuming an autoregressive lag 1, i.e., AR(1), serial correlation structure among the measurements as well as simulation studies. By evaluating the power to detect effects in many different settings, we show that the influence of serial correlation and heteroscedasticity on power can be substantial, but can also be mitigated to some degree through the use of appropriate multiple evaluation periods. We also show that the detection of certain types of carry-over effects can be heavily influenced by design considerations as well." @default.
• W2955169092 created "2019-07-12" @default.
• W2955169092 creator A5037233275 @default.
• W2955169092 creator A5043654076 @default.
• W2955169092 date "2019-07-02" @default.
• W2955169092 modified "2023-10-18" @default.
• W2955169092 title "Power and Design Issues in Crossover-Based N-Of-1 Clinical Trials with Fixed Data Collection Periods" @default.
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• W2955169092 doi "https://doi.org/10.3390/healthcare7030084" @default.
• W2955169092 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6787650" @default.
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