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AMERICAN PSYCHIATRIC ASSOCIATION A. A total of at least six (or more) items from (1), (2) and (3) must be present, with at least two from (1) and at least one from each of (2) and (3).
(1) Qualitative impairment in social interaction, as manifested by at least two of the following:
(a) marked impairment in the use of multiple nonverbal behaviors such as eye-to-eye
gaze, facial expression, body postures, and gestures to regulate social interaction;
(b) failure to develop peer relationships appropriate to developmental
level
(c) 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)
(d) lack of social or emotional reciprocity
(2) Qualitative abnormalities in communication as manifested by at least one of the following:
(a) 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 gestures or mime)
(b) in individuals with adequate speech, marked impairment in the ability to initiate or sustain a conversation with
others
(c) stereotyped and repetitive use of language or idiosyncratic language
(d) lack of varied, spontaneous make-believe play or social imitative play appropriate to developmental level
(3) Restricted repetitive and stereotyped patterns of behavior, interests, and activities, as manifested by at least one of
the following:
(a) encompassing preoccupation with one or more stereotyped patterns of interest that is abnormal either in
intensity or focus
(b) apparently inflexible adherence to specific, nonfunctional routines or rituals
(c) stereotyped and repetitive motor mannerisms (e.g., hand or finger flapping or twisting, or complex whole-body
movements)
(d) persistent preoccupation with parts of objects
B. Delays or abnormal functioning in at least one of the following areas, with onset prior to age 3 years:
(1) Social interaction
(2) Language as used in social communication, or
(3) Symbolic or imaginative playC. The disturbance is not better accounted for by Rett’s Disorder or Childhood Disintegrative Disorder.