In contrast, intracranial volume is consistently larger in boys than in girls, starting with neonates (+2–9%) (Gilmore et al. 2007; Qiu et al. 2013) and continue to persist in adolescents and in adults (+11.9 to14.6%) (Blatter et al. 1995; R. C. Gur et al. 1999; Raz et al. 2004). Neither the volumes of lateral ventricle or corpus callosum show a gender-by-age interaction during the development, with boys having larger ventricle volumes but girls showing larger corpus callosum relative to the total brain volume across the age span (Giedd et al. 1996; Lenroot et al. 2007).
