The following is from Diagnostic and Statistical Manual of Mental Disorders: DSM IV
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A total of six (or more) items from (A), (B), and (C), with at least two from (A), and one each from (B) and (C)
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Qualitative impairment in social interaction, as manifested by at least two of the following:
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Marked impairments in the use of multiple nonverbal behaviors such as eye-to-eye gaze, facial expression, body posture, and gestures to regulate social interaction
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Failure to develop peer relationships appropriate to developmental level
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A lack of spontaneous seeking to share enjoyment, interests, or achievements with other people, (e.g., by a lack of showing, bringing, or pointing out objects of interest to other people)
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Lack of social or emotional reciprocity ( note: in the description, it gives the following as examples: not actively participating in simple social play or games, preferring solitary activities, or involving others in activities only as tools or "mechanical" aids)
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Qualitative impairments in communication as manifested by at least one of the following:
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Delay in, or total lack of, the development of spoken language (not accompanied by an attempt to compensate through alternative modes of communication such as gesture or mime)
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In individuals with adequate speech, marked impairment in the ability to initiate or sustain a conversation with others
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Stereotyped and repetitive use of language or idiosyncratic language
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Lack of varied, spontaneous make-believe play or social imitative play appropriate to developmental level
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Restricted repetitive and stereotyped patterns of behavior, interests and activities, as manifested by at least two of the following:
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Encompassing preoccupation with one or more stereotyped and restricted patterns of interest that is abnormal either in intensity or focus.
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Apparently inflexible adherence to specific, nonfunctional routines or rituals
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Stereotyped and repetitive motor mannerisms (e.g. hand or finger flapping or twisting, or complex whole-body movements)
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Persistent preoccupation with parts of objects
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Delays or abnormal functioning in at least one of the following areas, with onset prior to age 3 years:
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Social interaction
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Language as used in social communication
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Symbolic or imaginative play
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The disturbance is not better accounted for by Rett's Disorder or Childhood Disintegrative Disorder
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