Linear regression showing the effect of IGF2/H19 methylation principal components upon age 17 years anthropometry. The β-coefficient and 95% confidence interval of the principle components of IGF2/H19 methylation are shown for a unit change in anthropometric measure. Principal component 1 (indicated by gray shaded bars and solid confidence interval lines) reflects within subject mean of IGF2/H19 methylation. Principal component 2 (indicated by open bars and dotted confidence interval lines) reflects within-subject standard deviation of the IGF2/H19 methylation. * indicates a P-value <0.05 and ** indicates a P-value <0.005.