Table 1. Descriptive statistics for demographic variables for the intervention and control groups.

	BabyMind M (SD) Range	Control M (SD) Range	t statistic	Effect size (d)
Infant age (weeks)	25.85 (2.14) 20–32	28.55 (4.29) 21–48	4.86**	.84
Maternal age	28.52 (7.12) 15–44	29.60 (6.64) 16–47	1.08	.16
Maternal education	5.00 (1.52) 2–7	5.38 (1.59) 2–7	1.66a	.24
Number of children	1.41 (0.63) 1–3	1.24 (0.50) 1–3	2.13*	.30
Infant temperament	2.93 (2.23) 0.17–8.83	2.99 (2.24) 0–9.17	0.16	.03

^ap < .10

*p < .05

**p < .001