ASD, which affect six out of 1,000 children, range from mild to seere forms. The disorders are caused by chromosomal rearrangements in 3 to 6 percent of cases.

• 1000名儿童当中有6名儿童受到ASD的影响，ASD从轻度到重度不等。3%25到6%25的这种紊乱症是由于染色体重排所致。