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. Author manuscript; available in PMC: 2015 Jul 1.
Published in final edited form as: Matern Child Health J. 2014 Jul;18(5):1176–1189. doi: 10.1007/s10995-013-1348-0
Participant
(N=744)
Non-
Participant
(N=637)
P-
value2

Race, n (%) <.0001

Black 604 (81) 566 (89)
Other 140 (19) 71 (11)

Education, n (%) 0.20

Less than high school 243 (33) 182 (29)
High school 182 (24) 176 (28)
More than high school 319 (43) 279 (44)

Employment, n (%) 0.02

Student 233 (31) 164 (26)
Employed 224 (30) 219 (34)
Unemployed (looking for work) 78 (10) 48 (8)
Unemployed (not looking for work) 84 (11) 73 (11)
Missing 125 (17) 133 (21)

Maternal Age (years old), n (%) 0.24

> 20 184 (25) 152 (24)
20 – 24 300 (40) 234 (37)
25 – 29 159 (21) 158 (25)
30 – 34 72 (10) 57 (9)
> 34 29 (4) 36 (6)

Country, n (%)1 0.20

US born 685 (92) 554 (90)
Non-US born 59 (8) 61 (10)

Baby Weight (g), mean (IQR) 3282 (2970 – 3553) 3289 (2950 – 3590) 0.06

Maternal Age (years old), mean (IQR) 23 (20 – 26) 24 (20 – 27) 0.08
1

22 subjects missing data for this variable.

2

P-value determined using chi square test.