Table 1.

Sample Characteristics

Maternal Characteristics (N = 136)	(M ± SD) (range) or (%)*
Age at Delivery	30.28 ± 5.08 (19.06 – 44.63)
Cohabitating with Child’s Father	91.0
Primiparous	43.4
Ethnicity
Non-Hispanic White	50.7
Latina	29.4
African American or Black	2.9
Asian	8.1
Multi-Ethnic	8.8
Household Income
$0-$30,000	20.6
$30,001-$60,000	25.7
$60,001-$100,000	33.8
Over $100,000	19.9
Years of Education	15.99 ± 2.35 (9 – 19)
Obstetric Complications Sum Score	0.34 ± 0.56 (0 – 2)
Maternal Sensitivity Composite (6 months)	9.98 ± 1.06 (6.5 – 12.0)
Maternal Sensitivity Composite (12 months)	9.67 ± 1.67 (4.5 – 12.0)
Child Characteristics (N = 136)
Sex (% Male)	58.1, n=79
Apgar Score (5 min)	9.00 ± 0.27 (8 – 10)
Gestational Age at Birth (GAB)	39.44 ± 1.26 (35.29 – 42.57)
Birth Weight Percentile**	52.77 ± 27.90 (1 – 99)
Mental Developmental Index (MDI)	97.71 ± 16.39 (54 – 140)
Negative Affectivity (ECBQ)	2.80 ± 0.58 (1.38 – 5.08)

^*Values presented as (means ± SD) or (%) where applicable

^**Birth weight percentile was calculated according to the infant’s sex and gestational age at birth.