. Author manuscript; available in PMC: 2009 Jan 1.

Published in final edited form as: Infant Behav Dev. 2007 Jul 23;31(1):51–61. doi: 10.1016/j.infbeh.2007.06.003

Table 1.

Characteristics of Families in Two Referral Categories

Variable	Full-term infants (with medical problems)	Preterm infants	Difference
Maternal education	9.08 (3.31)	10.02 (9.50)	.94
Maternal age	26.44 (5.54)	30.84 (6.86)	-4.40^**
Weight for age	82.57 (13.82)	54.71 (70.01)	-27.86^**

Note. Education is last grade completed. Weight for age = birth weight (grams)/gestational age (weeks). SDs are shown in parenthesis.

^**

p <.01.