<Li> Several metabolic defects, such as phenylketonuria, are associated with autistic symptoms . </Li> <Li> Minor physical anomalies are significantly increased in the autistic population . </Li> <Li> Preempted diagnoses . Although the DSM - IV rules out concurrent diagnosis of many other conditions along with autism, the full criteria for Attention deficit hyperactivity disorder (ADHD), Tourette syndrome, and other of these conditions are often present and these comorbid diagnoses are increasingly accepted . </Li> <Li> Sleep problems affect about two - thirds of individuals with ASD at some point in childhood . These most commonly include symptoms of insomnia such as difficulty in falling asleep, frequent nocturnal awakenings, and early morning awakenings . Sleep problems are associated with difficult behaviors and family stress, and are often a focus of clinical attention over and above the primary ASD diagnosis . </Li>

The dsm-iv-tr classifies autism related conditions as members of a group of
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