Table 1. Descriptive statistics for sample characteristics (N = 41).

	M (SD) or % (n)	Range
Mother
Age (years)	17.7 (1.4)	14–20
Race/ethnicity
Hispanic/Latina	93% (38)
African American	7% (3)
Pre-pregnancy body mass index	24.2 (5.5)	15.1–39.2
Cesarean section	15% (6)
Birth complications	15% (6)
Infection	2% (1)
Preeclampsia/hypertension	2% (1)
Other	10% (4)
Infant
Gestational age at birth (weeks)	39.3 (1.2)	36.4–41.6
Postnatal age at scan (weeks)	2.7 (1.3)	0.5–6.6
Postmenstrual age at scan (weeks)	42.2 (1.6)	38.7–47.0
Postnatal age at 4-month time point (weeks)a	18.7 (1.3)
Sex (female)	39% (16)
Birth weight (grams)	3193.4 (430.1)	2475.0–4315.0

^a n = 27