Figure 2.
Heightened areas of ASD relative risk in Utah by age group and surveillance year: A) children aged four at the time of surveillance in SY2006 (2002–4 sample; diagonal hatch) and SY2008 (2004–4 sample; yellow), B) children aged six at the time of surveillance in SY2006 (2000–6 sample; diagonal hatch) and SY2008 (2002–6 sample; blue), and C) children aged eight at the time of surveillance in SY2002 (1994–8 sample; diagonal hatch) and SY2008 (2000–8 sample; pink).