Figure 1. Log-Linear Model for IQ Versus Concurrent Blood Lead Concentration, Adjusted for HOME Score, Maternal Education, Maternal IQ, and Birth Weight.

The mean IQ (95% confidence intervals) for the intervals <5 µ/dl, 5–10 µ/dl, 10–15 µ/dl, 15–20 µ/dl, and >20 µ/dl are shown.

(Figure by authors, adapted from [11]).