Table 1.

Demographic characteristics of mother-infant pairs in the IFED study (n = 147)

	Soy	Cow	Breast	Total
No. of mother–infant pairs	54	55	38	147
Maternal race, n (%)
Black	42 (78)	45 (82)	14 (37)	101 (69)
White	11 (20)	7 (13)	16 (42)	34 (23)
All other races	1 (2)	3 (5)	8 (21)	12 (8)
Maternal education, n (%)
Less than high school	11 (20)	19 (35)	0 (0)	30 (20)
High school or GED	26 (48)	16 (29)	8 (21)	50 (34)
Some college or associates	14 (26)	15 (27)	10 (26)	39 (27)
College or postgraduate	3 (6)	5 (9)	20 (53)	28 (19)
Maternal age (years)
Median (quartiles)	25 (22, 29)	25 (20, 30)	28 (24, 32)	26 (21, 30)
Neonatal weight (kg)
Median (quartiles)	3.3 (2.9, 3.4)	3.2 (3.0, 3.5)	3.4 (3.2, 3.7)	3.3 (3.0, 3.5)
Gestational age (weeks), n (%)
37	5 (9)	5 (9)	1 (3)	11 (7)
38	9 (17)	9 (16)	4 (10)	22 (15)
39	27 (50)	17 (31)	11 (29)	55 (37)
40	10 (18)	19 (35)	9 (24)	38 (26)
41	3 (6)	5 (9)	13 (34)	21 (14)