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Introduction This present research was a cross-sectional study examining the outcome and adjustment of 64 individuals at their early adulthood (18 to 28 years old).They all had normal intelligence but were diagnosed as having autism spectrum disorder (ASD) as children. / Method The participants of this study were recruited from a child psychiatric clinic or from the community. All were Chinese living in Hong Kong. All except five were males, aged from 18 to 28, with mean age at 21.7 years (SD=2.5). All had a full IQ score of 75 or above (mean full IQ was 96.4 (SD=13.1, range 75-129), verbal IQ 96.3 (SD=13.7, range 73-128) and performance IQ 97.3 (SD=14.7, range 72-139). They and/or their parents were administered a range of tests or interviews to assess their current outcome and adjustment at early adulthood. / Results and Discussion The participants of this study were under-achieved both in educational attainment and employment when compared to population age peers. 32% (21 out of 64) were found no longer meeting a diagnosis of autism in adulthood, but only seven participants out of the 32% fell below the clinical range in all three domains of autistic deficits. The majority still had impairment in at least one aspect of the triad of autistic deficits. Their intellectual functioning had been stable with a small increase in mean verbal IQ. The overall outcome in terms of a composite score consisting of work, friendship, independence, autistic-type stereotyped repetitive behaviours, and language use was relatively better than those of past studies in Western countries in that 42% had a 'good' outcome. It was argued however that the relatively positive outcome was attributed in part to the results of supportive and facilitative environmental factors such as a large labour market, a buoyant economy, and technological advances, including the mass availability of computers. The participants of this study also experienced more general psychological disturbances other than autism than the general population. Finally, as in previous Western studies, childhood IQ, especially verbal IQ, proved to be a robust predictor of adult outcome in most areas. Results of the present study confirm the findings of Western studies that despite improvement in some individuals at early adulthood, significant impairment still persisted for the majority, reconfirming that ASD as largely a chronic disorder. The need for services tailored to adult problems of autism was called for. / Poon Mak, Sui Man. / Adviser: Patrick Leung. / Source: Dissertation Abstracts International, Volume: 72-11, Section: B, page: . / Thesis (Ph.D.)--Chinese University of Hong Kong, 2009. / Includes bibliographical references (leaves 249-258). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [201-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstract also in Chinese; some appendices in Chinese.