"When data from all 14 ADDM sites in the 2008 surveillance year were combined, overall estimated ASD prevalence was 11.3 per 1,000 (one in 88) children aged 8 years (range: 4.8 [Alabama]–21.2 [Utah])"
That's one in 47, or 88, or 208. State estimates that differ by a factor of five do not bespeak a settled concept.
(sorry - can't quickly get Excel to put state names in)
Slightly more in the 10-15 bracket, but there's no conclusive bunching at any level. Small gaps at 8-10 and a larger one at 16-20, but with more states counted you could probably fill those holes in. It's a lottery.
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