Table 2.

Demographic characteristics of PDS-I and PDS-II (Means, standard deviations, frequencies, and percentages).

Characteristic	PDS-I (n = 155)		PDS-II (n = 146)		Analysis
	N	%	N	%	p-value
Female	52	33.55	61	41.78	0.14
Maternal Race^b
Caucasian	85	57.43	77	53.47	0.69
African American	53	35.81	54	37.50
Asian	10	6.76	13	9.03
Traumatic Life Events	13	8.39	9	6.16	0.46
Daily Life Stress	55	35.48	61	41.78	0.26
Negative Affect	33	21.29	23	15.75	0.21
Pregnancy Specific Anxiety	22	14.19	25	17.12	0.48
	Mean	SD	Mean	SD	p-value
Birth Weight (Grams)	3328.84	524.55	3321.61	580.19	0.91
Gestational Age at Interview (Weeks)	16.52	6.70	15.12	6.80	0.07
Gestational Age at Birth (Weeks)	40.13	2.36	39.94	2.42	0.50
Maternal Age	28.11	6.10	29.27	8.41	0.17
Maternal Education^a	2.98	1.41	2.82	1.76	< 0.01

Maternal education values are based on a rating scale in which 2 = high school graduate – no other special school; and 3 = high school graduate – plus special school like trade school, not college

Missing data for 7 subjects from PDS-I and 2 subjects from PDS-II; Percentages for PDS-I calculated using n = 148; Percentages for PDS-II calculated using n = 144