Table 1.

Participant demographic characteristics

Sample Characteristics (N=103)	Mean	Std. Dev.
Mother Age at Infant Birth (years)	32.84	3.94
Mother Education at Infant Birth (years)	16.81	4.62
Infant Age at 1-month Scan (days)	33.03	5.99
Gestation (weeks)	39.52	1.38
Birth weight (lbs)	7.64	1.15
Birth Length (in)	20.20	1.18
Head Circumference (in)	13.67	.58
APGAR Score (1 Min/5 Min)	7.87/8.80	1.84/.70
Infant Sex	n = 52 female
Family Income at Infant Birth	Median = $80,001 to $100,000
Mothers’ Marital Status at Infant Birth	n = 90 married to father; n = 3 single; n = 1 divorced; n = 1 separated; n = 5 missing
Infant Racial Background
African American/Black	2
Asian	6
Caucasian/White	89 (12 Hispanic)
Native Hawaiian or Other Pacific Islander	2
Mixed Race	1