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<p>which has led to a variety of hypotheses from within <a href="page.php?w=evolutionary_psychiatry">evolutionary psychiatry</a> that autistic traits have played a beneficial role over human evolutionary history.</p>

<p><big> Frequency </big></p>
<p>Different measures can be used to examine the frequency of autism, including <a href="page.php?w=Incidence_%28epidemiology%29">incidence</a> rates, point or period prevalence, or cumulative incidence.</p>

<p><big> Incidence and prevalence </big></p>
<p><a href="page.php?w=Epidemiology">Epidemiology</a> defines several</p><p>
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