Nocebo response intensity and influencing factors in the randomized clinical trials of functional dyspepsia: A systematic review and meta-analysis.

Objectives: In this study we aimed to evaluate the nocebo response rate in patients with functional dyspepsia (FD) and to explore its influencing factors.

Methods: A literature search of the EMBASE, PubMed, and Cochrane Library databases was conducted for all articles published up to March 2021. Randomized, parallel-designed, placebo-controlled trials on pharmacological interventions for patients with FD were included.