TABLE 1

Characteristics of the Study Population According to Prenatal Chlorpyrifos Exposure Level (N = 254)

CharacteristicHigh Exposure (n = 50)Lower Exposure (n = 204)P
Proportion, %Mean ± SDProportion, %Mean ± SD
Maternal characteristics
    Race/ethnicity
        Black24.275.8.02
        Dominican14.985.1
    Age, y24.60 ± 5.2725.09 ± 5.14NS
    Married12.218.2NS
    No high school degree40.033.3NS
    Maternal IQa84.28 ± 12.4387.26 ± 13.69NS
    HOME score38.46 ± 5.9539.78 ± 5.72NS
Infant characteristics
    Birth weight, g3239.58 ± 558.093450.93 ± 448.30.05
    Birth length, cm50.02 ± 2.4151.05 ± 3.60NS
    Birth head circumference, cm34.03 ± 1.6934.35 ± 1.84NS
    Gestational age, wk39.24 ± 1.3839.32 ± 1.49NS
    Male48.046.1NS
    Prenatal exposure to residential ETS56.031.9.002
  • The sample included all children who had reached 36 months of age with all required data elements. NS indicates not significant.

  • a Measured with the Test of Nonverbal Intelligence, Second Edition.42