Table 1. Human Subject Demographics.

Demographic		Comparison	Cocaine	Polydrug
Number of subjects		38	31	38
Maternal Ethnicity	Caucasian	34 (68%)	25 (64.1%)	17 (40.5%)
	African-American	12 (24%)	10 (25.6%)	20 (47.6%)
	Hispanic	1 (2%)	2 (5.1%)	20 (7.1%)
	Asian	2 (4%)	0 (0%)	1 (2.4%)
	Other	1 (2%)	2 (5.1%)	1 (2.4%)
Maternal Marital Status	Divorced	1 (2.3%)	6 (17.2%)	4 (11.8%)
	Married	24 (55.8%)	1 (2.8%)	5 (14.7%)
	Never Married	17 (39.6%)	24 (68.6%)	21 (61.7%)
	Separated	1 (2.3%)	4 (11.4%)	4 (11.8%)
Maternal Education	≤ High School	10 (22.7%)	16 (44.4%)	13 (39.5%)
	Some College/Trade School	6 (13.7%)	20 (55.6%)	14 (42.4%)
	College Graduate	14 (31.8%)	0 (0%)	4 (12.1%)
	Post Graduate Education	14 (31.8%)	0 (0%)	2 (6.0%)
Delivery Method	Vaginal	40 (80%)	33 (87%)	29 (69%)
	C-Section	10 (20%)	5 (13%)	13 (31%)
Infant Birth Weight (g)		3506.8±52.4	3081.5±67.4	3388.9±78.2
Gestational Age (weeks)		39.9±0.2	38.9±0.3	39.7±0.2
Age at Assessment (days)		24.5±1.0	30.2±2.1	25.6±1.1

Note: Values are raw numbers, with percentages in parentheses, and Mean ± SEM where appropriate.