TABLE 2

BSID-II Means and Proportion Delayed at 12, 24, and 36 Months According to Chlorpyrifos Exposure Level (N = 254)

DomainTotalHigh ExposureLower ExposureP
MDI score, mean ± SD
    12 mo94.03 ± 9.7893.72 ± 9.6494.11 ± 9.84.810
    24 mo85.10 ± 12.4183.69 ± 12.2485.45 ± 12.46.396
    36 mo89.58 ± 11.4187.39 ± 10.0890.11 ± 11.67.155
PDI score, mean ± SD
    12 mo96.22 ± 12.2193.35 ± 12.9496.95 ± 11.95.074
    24 mo97.04 ± 11.4798.70 ± 10.9096.62 ± 11.60.274
    36 mo100.46 ± 12.9895.69 ± 14.71101.63 ± 12.28.006
Mild/significant mental delay, %a
    12 mo15.717.015.4.468
    24 mo49.360.046.7.076
    36 mo32.945.529.9.048
Mild/significant psychomotor delay, %b
    12 mo14.021.712.1.078
    24 mo13.213.013.3.595
    36 mo10.524.47.1.002
  • Age-specific sample sizes ranged from 225 to 228 because of missed and/or unscorable assessments (<50).

  • a MDI score of ≤85.

  • b PDI score of ≤85.