The Structure of Research Questions in Randomized Controlled Trials in the Rehabilitation Field: A Methodological Study.

OBJECTIVE:The aim of this study is to assess whether and how the PICO (Population, Intervention, Comparator, and Outcomes) format is described to frame research questions in randomized controlled trials looking at effectiveness of rehabilitation interventions. DESIGN:A methodological study was conducted. Randomized controlled trials in the rehabilitation field, published between July 1, 2019, and December 31, 2019, were included. The framing of the primary research question from each trial was evaluated. RESULTS:A total of 97 randomized controlled trials were included in the analysis. The most frequent framing of the primary research question was as an "objective" statement (55%), and in 33% of the articles, this was stated as an "objective" together with a "hypothesis" description. All PICO elements were present in 55% of research questions, but only 49% have used the statement suggested by Cochrane. CONCLUSION:The findings of this study suggest that a specific item about the "research question" and the rationale that drove the proposed design following the form suggested by Cochrane should be included in the RCT Rehabilitation Checklist.