**4. Prevalence**

Using narrow criteria of autism ADI-R, etc., Baird et al. [29] found a prevalence of 25 per 10,000, but when the broader autism spectrum criterium was used, a prevalence of 116 per 10,000 was found. This unfortunately means that over three quarters of the persons with autism in the community have what I would call "real" autism or clinical autism (autism spectrum disorder) and were missed by these narrow-based instruments. Currently, the prevalence of autism is 1/59 CDC and 1/37 males [30].
