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Human Health Risks from Low-Level Environmental Exposures: No Apparent Safety Thresholds

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]).

doi: https://doi.org/10.1371/journal.pmed.0020350.g001