Figure 3From: A comparison of temporal trends in United States autism prevalence to trends in suspected environmental factors Temporal trend in blood lead (Pb) concentration in U.S. children compared to the temporal trend in autism, constructed from a composite of CDDS 2002 snapshot data (covering birth years 1970–1997) and California IDEA 5 year-old tracking data for birth years 1995–2005 (see Section Method s for details). Back to article page