A Possible Source of Heterogeneity in Nociceptive Flexion Reflex (NFR) Threshold Among Patients with Fibromyalgia: Systematic Review and Meta-Analysis

Objectives: We aimed to investigate the possibility of sample size as a possible source of heterogeneity in trials comparing the nociceptive flexion reflex threshold (NFRthr) in fibromyalgia (FM) patients and healthy controls.Methods: A systematic search strategy was designed and conducted in electronic databases such as Ovid MEDLINE, Cochrane Libraries, Embase, and PsycINFO. In total, nine scholarly records were filtered by the inclusion and …