Exploring Comorbidity Within Mental Disorders Among a Danish National Population

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Abstract
Comorbidity, defined as the presence of 1 or more disorders in relation to an index disorder,1 has been the focus of a substantial body of research during the 5 decades since the term was introduced.2 In the mental health field, it is widely acknowledged that individuals treated for incident mental disorders are at increased risk of subsequently developing other mental disorders.3 Based on a survey of mental health among adolescents 13 to 17 years of age, Kessler et al4 reported that 27.9% of respondents met criteria for 2 or more disorders. Several community surveys have reported that, among respondents with at least 1 mental disorder, 45% to 54% have 1 or more additional lifetime diagnoses.3,5,6

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