TABLE 7

Logistic Regression Models Testing Effects of Chlorpyrifos on the Odds of Psychomotor Delay at 12, 24, and 36 Months, Adjusted for Race, Gender, Gestational Age, Maternal Education, Maternal IQ, ETS Exposure, and Home Environment

VariableOdds Ratio (95% CI)
Model 1: 12 moModel 2: 24 moModel 3: 36 mo
Prenatal chemical exposures
    ETSa0.95 (0.42–2.15)0.77 (0.33–1.80)1.82 (0.69–4.79)
    Chlorpyrifosb1.88 (0.78–4.53)1.01 (0.37–2.76)4.52 (1.61–12.70)
Covariates
    Race/ethnicityc1.59 (0.69–3.67)0.86 (0.36–2.09)0.55 (0.19–1.54)
    Genderd0.91 (0.42–1.96)0.74 (0.33–1.63)1.89 (0.75–4.75)
    Gestational age1.00 (0.78–1.28)0.88 (0.68–1.14)0.97 (0.68–1.38)
    Maternal IQe1.01 (0.98–1.04)0.98 (0.95–1.02)1.03 (0.99–1.06)
    Low maternal educationf1.10 (0.49–2.50)1.24 (0.54–2.81)0.36 (0.12–1.10)
    HOME score0.99 (0.92–1.06)1.01 (0.94–1.08)0.94 (0.86–1.02)
  • Sample sizes for age-specific models varied from 227 to 228 because of missed and/or unscorable assessments (<50).

  • a Prenatally exposed = 1; not exposed = 0.

  • b High exposure (>6.17 pg/g) = 1; low exposure (≤6.17 pg/g) = 0.

  • c Black = 2; Dominican = 1.

  • d Male = 2; female = 1.

  • e Measured with the Test of Nonverbal Intelligence, Second Edition,42 natural logarithmically transformed.

  • f No high school degree = 1; high school degree = 0.