Table I.

Demographic Data on Mother–Infant Pairs Who Completed the Study^a

	Drug	Comparison	F
Maternal characteristics
M age (years)	27.2 (6.4)	24.5 (5.0)	2.20
M education (years)	11.2 (1.2)	11.6 (1.0)	1.27
M month prenatal care initiated	4.8 (1.8)	3.0 (1.8)	10.16a
M no. of children	2.6 (1.3)	2.0 (1.1)	2.33
% single (not cohabiting)	95%	90%
% African American	85%	90%
Infant characteristics
M birth weight (grams)	2936 (357)	3238 (514)	4.67b
M birth length (cm)	49.2 (2.25)	50.1 (2.73)	1.34
M ponderal index	2.47 (0.28)	2.56 (0.26)	1.22
M Apgar (1 minute)	7.7 (1.4)	7.7 (1.1)	0.01
M Apgar (5 minutes)	9.0 (0.3)	8.8 (0.5)	2.11
% male	55%	60%

^an = 20 for each group. Numbers in parentheses are standard deviations.

^bp < .05.

^cp < .01.