An epidemiological study done by V. Wong & S. Hui, published in 2007, indicated the prevalence was 16.1 per 10,000 for children under 15 years old between the years of 1986 and 2005, in Hong Kong. Similar rates are reported in Australia and North America. The Centres for Disease Control in United States estimates the prevalence rate of ASD to be 2-6 per 1,000.