Design of treatment trials for functional gastrointestinal disorders

Abstract

Until recently many clinical trials of functional gastrointestinal disorders (FGIDs) suVered from important weaknesses in trial design, study execution, and data analysis. This makes it diYcult to determine whether truly eYcacious therapies exist for these disorders. One of the important methodologic problems is the absence of validated outcome measures and lack of consensus among stakeholders on how to measure outcome. Currently much of the eVort is being put into the development of validated outcome measures for several of the FGIDs. The randomized, controlled trial with parallel groups is the design of choice. In this report, guidelines are given for the basic architecture of intervention studies of FGIDs. Further studies on design issues are required to ensure the recommendations will become evidence based in the future.