IQ Distribution: What Lead Does to a Population
Drag the slider to see how blood lead level shifts the IQ bell curve of an entire population. Every point of average IQ loss is millions of people pushed below functioning thresholds.
0.0
IQ points lost (mean shift)
2.3%
Below IQ 70 (intellectual disability range)
15.9%
Below IQ 85 (low-average range)
2.3%
Above IQ 130 (gifted range)