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The relationship between the mtDNA content and maternal age. (A) Linear regression analysis, blue lines indicate linear regressions; gray shading indicates 95% confidence regions for linear regressions. (B) subgroup analysis of different maternal ages (<35, 35-37 and ≥38 years); Kruskal-Wallis test was used to compare the mtDNA content across different age groups and p values less than 0.05 were considered significant.
