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. Author manuscript; available in PMC: 2012 Mar 1.
Published in final edited form as: Neurotoxicology. 2010 Dec 21;32(2):261–267. doi: 10.1016/j.neuro.2010.12.009

Table 1. Comparison of Maternal Characteristics in Original Birth Cohort (N = 404) with those at 7 to 9 Year Follow Up (N = 137).

Characteristics of Population Original Cohort Follow Up Cohort
N % N %
Maternal Age at Enrollment (years)

 < 20 142 35.1 47 34.3
 20 – 24 132 32.7 50 36.5
 25 – 29 44 10.9 16 11.7
 ≥ 30 86 21.3 24 17.5

Maternal Race/Ethnicity
 White 86 21.3 21 15.3
 Black 112 27.7 45 32.9
 Hispanic 200 49.5 71 51.8
 Other 6 1.5 0 0

Maternal Education
 < High School 118 29.2 18 13.1
 High School 83 20.5 26 19.0
 Some College 103 25.5 58 42.3
 ≥ College Degree 100 24.8 30 21.9

Marital Status at Enrollment
 Married 117 29.0 36 26.3
 Living w/ Baby's Father 98 24.3 23 16.8
 Single/Divorced/Widowed 189 46.8 76 55.5

Smoke during Pregnancy (ever) 67 16.6 8 5.2

Alcohol during Pregnancy (ever) 59 14.9 23 15.0

Mother is Primary Caretaker 112 73.2

Breastfeeding
 < 1 month 61 43.9
 1-4 months 43 30.9
 >4 months 35 25.2