Autism is a result of a neurological disorder that affects the functioning of the brain. As such, autism and related conditions are now considered to be the most prevalent development disorder.

While at the beginning of the 1990s it was thought that autism affected 5 in every 10,000 individuals, the most recent detailed studies in various countries have revealed that the ratio is 1 to 100, which means that 6.000 individuals among the population of the Grand Duchy of Luxembourg.

Autism is four times more prevalent among boys than among girls and it knows no race or ethnic or social boundaries.