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To investigate the association of maternal body mass index (BMI) and recurrent pregnancy loss (RPL). Systematic review and meta-analysis. Not applicable. A total of 3,833 women with RPL and 4,083 women as controls. Studies were identified through a search of PubMed, Embase, Scopus, and Cochrane. The primary outcome of interest was RPL using the mean differences in maternal BMI as the predictor variable. The results of the meta-analysis were reported as the mean difference with a 95% confidence interval. In total, 892 studies we