Comorbidity refers to a person having two or more medical diseases or conditions simultaneously or over a period of time. Psychiatric comorbidity refers to the situation where these two or more conditions are mental disorders. Naturally, comorbidity exists. After all, in the same way a person could have both a broken arm and hypertension, an adolescent might meet criteria for a major depressive disorder and a specific anxiety disorder. In fact, the expected rate of comorbidity can be calculated by multiplying the prevalence rate of each disorder, thereby estimating the comorbidity rate assuming only random co-occurrence. Interestingly, psychiatric comorbidity rates, including those for children and adolescents, far exceed these base rates and follow meaningful patterns (see for instance, Merikangas et al. 2010). While some of these higher than expected comorbidity rates are likely due to conceptual errors (e.g., mistakenly thinking two disorders are distinct when they are not) or...
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Wilkie, D.P., Orimoto, T.E., Miyamoto, K.D.S., Stalk, HL., Mueller, C.W. (2016). Comorbidity of Psychiatric Disorders. In: Levesque, R. (eds) Encyclopedia of Adolescence. Springer, Cham. https://doi.org/10.1007/978-3-319-32132-5_198-2
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