The first report from the CPB study in a large group of healthy pediatric twins found that heritability values ranged from 70% to 90% for brain volumes for all structures except the ventricles and cerebellum (Wallace et al. 2006) similar to values previously reported in adults. High heritability values for regional gray and white matter volumes was also reported using a voxel-based morphometry method in a large group of pediatric twins aged 9–10 years from an ongoing longitudinal study in the Netherlands (Peper et al. 2009)
