Separately for each cohort, our analysis identified developmental patterns in myelin by measuring the age effects at each vertex of the template. To do so, a general linear model was fitted to the baseline myelin content viewing age as a predictor and sex (female/male), ethnicity (Caucasian/African-American/Others), svol (supratentorial volume in cc), and site (NCANDA collection sites; omitted in HCP analysis) as confounding factors for each subject s, myelins∼β0+βage⋅ages+βsex⋅sexs+βethnicity⋅ethnicitys+βsvol⋅svols+βsite⋅sites.
