If Bellinger's own lead-IQ model is correct...decrease in blood lead concentration..should have resulted in a 3 point increase in IQ scores This is an interest

If Bellinger's own lead-IQ model is correct...decrease in blood lead concentration..should have resulted in a 3 point increase in IQ scores This is an interesting point. I haven't seen an explanation for the Flynn Effect continuing as blood lead levels rose through the 20th century. If IQ levels would have risen faster without lead then the increases should have been even more substantial since lead levels dropped.