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Background: Childhood trauma is associated with major depressive disorder (MDD) and bipolar disorder (BD) in adults. However, no meta-analysis was performed on the prevalence of different types of childhood trauma in adults with affective disorders, using the Childhood Trauma Questionnaire (CTQ).Methods: Four databases were used to search articles regarding the prevalence of childhood emotional abuse (CEA), childhood physical abuse (CPA), childhood sexual abuse (CSA), childhood physical neglect (CPN), and childhood emotional neglect (CEN) in patients with MDD and BD using the CTQ.Results: A total of 17 and 11 articles were found analyzing patients with MDD and BD, respectively. A pooled prevalence rate of 33.0% and 30.0% for CEA, 17.0% and 18.0% for CPA, 19.0% and 22.0% for CSA, 37.0% and 31.0% for CEN, and 31% and 30.0% for CPN was found in patients with MDD and BD respectively. A difference in 95% confidence interval in the CSA rate between men and women was found in patients with MDD in the gender subgroup and in the rate of some types of childhood trauma in the continent subgroup in both patient types.Limitations: A limited number of articles were included in some continents, thus, the heterogeneity in the meta-analysis was generally high.Conclusion: The prevalence of CEA, CEN, and CPN in patients with affective disorders was relatively high, whereas that of CPA and CSA was relatively low. These childhood traumas might be affected by continent and gender. [ABSTRACT FROM AUTHOR]