Table 1.

Overall sample characteristics (N = 149)

Maternal age at delivery, years (M, SD)	29.29 (5.09)
Maternal race/ethnicity (n, %)
White	74 (50%)
Latina	38 (25%)
Asian	15 (10%)
Black	1 (1%)
Pacific Islander	1 (1%)
Multi-ethnic	20 (13%)
Maternal education (n, %)
High school or less	57 (38%)
Associates or vocational degree	27 (18%)
4-year college degree	41 (28%)
Graduate degree	24 (16%)
Annual household income, USD (M, SD)	64,319 (33,279)
Cohabitating with child’s father (n, %)	135 (91%)
Infant sex, female (n, %)	73 (49%)
Infant birth order, first born (n, %)	70 (47%)
Length of gestation, weeks (M, SD)	39.53 (1.05)
Birthweight, grams (M, SD)	3,416.07 (446.08)
IBQ-R infant temperament dimensions (M, SD)
Negative affectivity	2.93 (0.51)
Orienting/regulation	5.00 (0.52)
Surgency/extraversion	4.33 (0.71)

Note. IBQ-R = Revised Infant Behavior Questionnaire.