The adverse effects of air pollution on the nervous system.

J Toxicol · 2012 · PMC3317189 · PMID 22523490

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an increasing trendno p-value reported

The prevalence for autism in the general population has been reported to range from 0.2 to 0.6% with an increasing trend over the recent years.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.