Half of US population exposed to adverse lead levels in early childhood.
Level 4 - case-series / case-control
Population-level demographic and epidemiological modeling study (grade by design analogy)
PubMed 35254913 · doi:10.1073/pnas.2118631119
What was done
Demographic and epidemiological modeling was used to estimate historical early childhood lead exposure among the living US population and project its cumulative cognitive impact as of 2015. Specific data sources and modeling methods are not described in the abstract.
What was found
An estimated >170 million Americans alive in 2015 experienced high lead exposure during early childhood, with several million exposed to five or more times the current reference level. Lead exposure was estimated to be responsible for a cumulative population-level loss of 824,097,690 IQ points.
Why it matters
This study highlights the substantial, enduring public health and cognitive burden carried by living US adults who experienced high early childhood lead exposures prior to regulatory bans.
Limits
The findings rely on macro-level modeling rather than direct longitudinal individual measurements. Specific modeling assumptions, data sources, confidence intervals, and other non-cognitive health outcomes are not detailed in the abstract.
Cited by
- supports Historical exposure to leaded gasoline resulted in an estimated loss of one billion IQ points in the United States population.