Fig. 4

Correlation between neonatal outcomes and mtDNA copy numbers. A Scatterplots show the Pearson’s correlation coefficients between the gestational age (week) and mtDNA copy numbers of newborns (left) and mothers (right). B Scatterplots show the correlations between the birth weight (g) and mtDNA copy numbers of newborns (left) and mothers (right). C Scatterplots show the correlations between the head circumference (cm) and mtDNA copy numbers of newborns (left) and mothers (right). D Scatterplots show the correlations between the placental weight (g) and mtDNA copy numbers of newborns (left) and mothers (right). E Scatterplots show the correlations between the umbilical cord length (cm) and mtDNA copy numbers of newborns (left) and mothers (right). Female and male newborns’ data are shown in red and blue, respectively. Because five outcome measures were tested against two hypothesized predictors, a Bonferroni-adjusted significance level of 0.005 (= 0.05/10) was calculated