Table 1.

Demographic information

	All subjects	Subjects with MRI scans, YLSI, and CANTAB data	Subjects with only MRI scans and YLSI data	p values (comparing subjects with and without CANTAB data)
Age (mean ± SD months)	142.357 ± 21.1226 months	140.714 ± 19.758 months	146.610 ± 24.44 months	F = 0.954, p = 0.333
Puberty (Tanner staging)	1.725 ± 1.283	1.7045 ± 1.280	1.7794 ± 1.328	F = 0.041, p = 0.840
Whole-brain volume (mm3)	1431.792 ± 130.30	1431.202 ± 117.34	1433.3212 ± 163.30	F = 0.003, p = 0.955
Gender (male, female)	32 males, 29 females	22 males, 22 females	10 males, 7 females	χ2 = 0.383, p = 0.536
SES (as indexed by maternal education)	6.0851 ± 0.974	6.20 ± 0.868	5.75 ± 1.215	F = 1.946, p = 0.170

Maternal education varied on a numeric scale from 1 to 8, denoting level of education obtained with possible choices of grade school, high school or general education diploma, 2-year college, trade, or technical school, 4-year college, or graduate school. SES, Socioeconomic status.