Table 3.

Correlation coefficients between neurodevelopmental test scores and CBLI1, CBLI2, and CBLI1 adjusted for age and mother’s education.

Neuro-test	CBLI 1	CBLI 2	CBLI 1 (adjusted for age and mother’s education)
WISC
Verbal comprehension	a0.746 (p = 0.021) +	a0.710 (p = 0.032) +	b0.682 (p = 0.113) +
Perceptual reasoning	0.406 (p = 0.278) +	b0.478 (p = 0.193) +	0.161 (p = 0.641) +
Working memory	a0.853 (p = 0.003) +	a0.906 (p = 0.001) +	a0.973 (p = 0.015) +
Processing speed	0.283 (p = 0.461) +	0.368 (p = 0.330) +	0.260 (p = 0.597) +
Full-scale IQ	a0.823 (p = 0.006) +	a0.872 (p = 0.002) +	b0.785 (p = 0.058) +
BRIEF
Behavioral regulation	b0.573 (p = 0.084) +	b0.617 (p = 0.057) +	0.477 (p = 0.216) +
Meta-cognition	b0.560 (p = 0.092) +	b0.517 (p = 0.126) +	0.355 (p = 0.277) +
Global executive composite	b0.614 (p = 0.059) +	b0.614 (p = 0.059) +	b0.450 (p = 0.189) +
CADS
ADHD index	0.313 (p = 0.378) +	0.110 (p = 0.762) +	0.291 (p = 0.484) +
DSM-IV inattentive	b0.513 (p = 0.129) +	0.277 (p = 0.438) +	b0.536 (p = 0.150) +
DSM-IV hyperactive	b0.583 (p = 0.077) +	b0.450 (p = 0.192) +	a0.636 (p = 0.050) +
DSM-IV total	a0.661 (p = 0.038) +	b0.465 (p = 0.176) +	a0.707 (p = 0.016) +
Externalizing problems	a0.943 (p = 0.000) +	a0.928 (p = 0.000) +	a0.937 (p = 0.002) +
Internalizing problems	a0.648 (p = 0.043) +	a0.655 (p = 0.040) +	b0.490 (p = 0.156) +
Behavioral symptom index	a0.853 (p = 0.002) +	a0.855 (p = 0.002) +	a0.703 (p = 0.006) +
Adaptive skills	b0.481 (p = 0.160) +	0.249 (p = 0.488) +	0.326 (p = 0.397) +

⁺Positive sign indicates worse neurodevelopmental performance with increased CBLI, current blood lead, or peak blood lead.

^aSignificant correlation (p < 0.05).

^bMarginally significant correlation (p < 0.20).