childhood and adolescence in this sample the group average brain size for males is approximately 10% larger than for females. This 10% differences has also been found in hundreds of adult neuroimaging and postmortem studies, frequently attributed to the larger body size of males. However, in our pediatric subjects the boys’ bodies are not larger than girl’s until after puberty, and girls are actually somewhat taller from ages 10–13 in both our samples and data from the CDC because of their earlier pubertal growth spurt.
