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Comparison of pregnancy frequency according to age (A), mtDNA copy number (B), and age (C) when stratified into < 35 and ≥ 35 years old. mtDNA copies are relatively quantified to the amount of B2M. All values are expressed as mean ± standard deviation (SD) obtained from two separate experiments (Duplo) (Pregnancy data according to mtDNA copies and age were analyzed using a t-test; pregnancy proportion according to age group was analyzed using Fisher’s exact test). *ns: not significant
