This study aims to estimate the reliable prevalence of fibromyalgia using meta-analysis method. Available databanks were searched using appropriate keywords. According to the heterogeneity between the results (indicated by Cochrane and I square indices), random- or fixed-effects model was applied to combine the point prevalences. Meta-regression models were used to assess the suspected factors in the heterogeneity. In 65 selected papers, 81 evidences regarding prevalence of fibromyalgia among 3,609,810 subjects from general population and specific groups were investigated. The total prevalences (95% confidence intervals) of fibromyalgia among general population, women, men, patients referring to rheumatology and internal departments, patients with Irritable bowel syndrome (IBS), hemodialysis patients and those with type 2 diabetes mellitus were estimated as of 1.78% (1.65, 1.92), 3.98% (2.80, 5.20), 0.01% (-0.04, 0.06), 15.2% (13.6, 16.90), 12.9% (12.70, 13.10), 6.30% (4.60, 7.90) and 14.80% (11.10, 18.40), respectively. In addition, prevalence of fibromyalgia in specified groups varied from 3.90% in hemodialysis patients to 80% in patients suffering from Behcet syndrome. This meta-analysis showed that prevalence of fibromyalgia in general population was significantly lower than that in populations with some diseases.
Keywords: Fibromyalgia; Meta-analysis; Prevalence; Systematic review.