Which of the following criteria is NOT included in the DSM-5 for diagnosing autistic disorder in children?

The criteria for diagnosing autistic disorder, as outlined in the DSM-5, focus primarily on social communication deficits, restricted interests, and repetitive behaviors. One key element of this diagnosis is that symptoms must be present within the early developmental period, typically recognized before age 3. This aligns with the requirement associated with the onset of symptoms.

Another crucial aspect includes impairments in social interaction, such as lack of social reciprocity, which refers to the failure to engage in back-and-forth conversation or shared emotional expressions. Stereotyped behaviors, including actions like hand flapping, are also characteristic features of the disorder.

In contrast, a depressed affect is not a diagnostic criterion outlined in the DSM-5 for autistic disorder. While individuals with autism may experience comorbid conditions such as anxiety or depression, these are not inherent features of autism itself. The presence of a depressed affect is not specific to autism; therefore, it does not belong in the set of diagnostic criteria for the disorder. Understanding the specific diagnostic criteria helps in the accurate identification and management of autism spectrum disorders.