Table 1. Population characteristics.

	All infants (N=72)	Infants followed to 24 months (N=40)
Infant characteristics
Male sex, n (%)	42 (58)	26 (65)
GA completed weeks, median (IQR)	28 (27 to 30)	28 (27 to 30)
Birth weight g, median (IQR)	1038 (815 to 1308)	1040 (775 to 1850)
Severe white matter injury, n (%)	11 (15)	4 (10)
Minor sensory impairments
Visual, n (%)	15 (20.8)	11 (27.5)
Hearing, n (%)	6 (8.3)	2 (5)
Primary caregiver education, n (%)
Unknown	1 (1)	2 (5)
Less than 12th grade	7 (10)	5 (12.5)
High-school graduation	24 (33)	11 (27.5)
Partial college or trade school	26 (36)	11 (27.5)
Graduated college	9 (12)	8 (20)
Graduate education	5 (7)	3 (7.5)

IQR (25%, 75th).

GA, gestational age.