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This paper presents the baseline demographic and clinical characteristics of the cohort, particularly the nature and severity of psychopathology.<\/jats:p><\/jats:sec><jats:sec><jats:title>Method<\/jats:title><jats:p>All eligible young people attending one of four <jats:italic>headspace<\/jats:italic> clinical services were invited to participate, and completed a battery of self\u2010report and interviewer\u2010administered measures of psychopathology and functional impairment at baseline, which will be repeated at the annual follow up.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Of 1615 eligible clients, 802 young people (66% women; mean age\u2009=\u200918.3 years) consented to participate and completed baseline assessments (participation rate\u2009=\u200950%). The severity of mental health problems varied, with 51% meeting the criteria for probable caseness related to generalized anxiety, 45% presenting with moderate to severe depressive symptoms and over a third experiencing subthreshold psychotic symptomatology. Disordered eating (32%) and problematic tobacco (56%), cannabis (30%) and alcohol (38%) use also affected a significant proportion. Overall, 39% of the cohort were classed as being functionally impaired at baseline.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>The <jats:styled-content style=\"fixed-case\">T<\/jats:styled-content>ransitions <jats:styled-content style=\"fixed-case\">S<\/jats:styled-content>tudy recruited a heterogeneous cohort at baseline in relation to the nature and severity of mental health problems and levels of functional impairment. The variation in clinical presentations within the cohort, from mild, through moderate to severe levels of psychopathology and impairment, increases the likelihood of the <jats:styled-content style=\"fixed-case\">T<\/jats:styled-content>ransitions <jats:styled-content style=\"fixed-case\">S<\/jats:styled-content>tudy ultimately being able to achieve its aims of empirically testing a clinical staging model for mental disorders.<\/jats:p><\/jats:sec>","DOI":"10.1111\/eip.12133","type":"journal-article","created":{"date-parts":[[2014,3,28]],"date-time":"2014-03-28T20:57:00Z","timestamp":1396040220000},"page":"487-497","source":"Crossref","is-referenced-by-count":66,"title":["Demographic and clinical characteristics of young people seeking help at youth mental health services: baseline findings of the <scp>T<\/scp>ransitions <scp>S<\/scp>tudy"],"prefix":"10.1111","volume":"9","author":[{"given":"Rosemary","family":"Purcell","sequence":"first","affiliation":[{"name":"Orygen Youth Health Research Centre Centre for Youth Mental Health The University of Melbourne  Melbourne Victoria Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anthony F.","family":"Jorm","sequence":"additional","affiliation":[{"name":"School of Population and Global Health The University of Melbourne  Melbourne Victoria Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ian B.","family":"Hickie","sequence":"additional","affiliation":[{"name":"Brain &amp; Mind Research Institute The University of Sydney  Sydney New South Wales Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alison R.","family":"Yung","sequence":"additional","affiliation":[{"name":"Orygen Youth Health Research Centre Centre for Youth Mental Health The University of Melbourne  Melbourne Victoria Australia"},{"name":"Institute of Brain, Behaviour and Mental Health University of Manchester  Manchester UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Christos","family":"Pantelis","sequence":"additional","affiliation":[{"name":"Melbourne Neuropsychiatry Centre The University of Melbourne and Melbourne Health  Melbourne Victoria Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"G. 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