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A 2016 survey in the United States reported a rate of 25 per 1,000 children for ASD. [374] Rates of autism are poorly understood in many low- and middle-income countries, which affects the accuracy of global ASD prevalence estimates, [375] but it is thought that most autistic people live in low- and middle-income countries. [376]
The cerebral blood volume value of gray matter is about 3.5 +/- 0.4 ml/100g, and the white matter is about 1.7 +/- 0.4 ml/100g. The gray matter is nearly twice that of white matter. [3] In both white and gray matter, cerebral blood volume decreases by about 0.50% per year with increasing age. [4]
Autistic Pride Day – a celebration of the neurodiversity of people on the autism spectrum on June 18 each year. Autreat – founded by members of ANI, this is a yearly gathering for autistic people along with parents and professionals to meet and share ideas in an autism-friendly environment.
Autism is associated with several genetic disorders, [4] perhaps due to an overlap in genetic causes. [5] About 10–15% of autism cases have an identifiable Mendelian (single-gene) condition, chromosome abnormality, or other genetic syndrome, [6] a category referred to as syndromic autism.
Hypofrontality is a symptom of numerous neurological diseases defined as reduced utilization of glucose and blood flow in the prefrontal cortex. Hypofrontality can be difficult to detect under resting conditions, but under cognitive challenges, it has been seen to correlate with memory deficits along with executive function deficits.
Unless rarely, fracture involves the suture lines (more common in children), then epidural hematoma may cross the suture lines. [4] As the blood accumulated in the epidural space is confined within suture lines, accumulation of additional blood will cause bulging in this space, and thus resulting in a typical "biconvex" appearance on CT scans. [3]