Comorbidity between and within childhood externalizing and internalizing disorders: reflections and directions

Area of Science:

• Child and Adolescent Psychiatry
• Psychopathology Research
• Diagnostic Classification Systems

Background:

• The concept of comorbidity in psychiatric diagnoses is controversial.
• Covariation among diagnoses challenges current psychiatric classification and diagnostic models.
• Comorbidity within and between childhood externalizing and internalizing disorders is a significant issue.

Purpose of the Study:

• To underscore important issues relevant to childhood comorbidity.
• To illustrate methodological and substantive reasons for comorbidity.
• To provide a framework for understanding the comorbidity of childhood disorders.

Main Methods:

• Utilized a distinction among common, broad-band specific, and narrow-band specific features.
• Examined comorbidity between and within childhood externalizing and internalizing disorders.
• Considered hierarchical models of psychopathology.

Main Results:

• The proposed framework helps understand the comorbidity of childhood externalizing and internalizing disorders.
• Hierarchical models offer a way to reconcile differing diagnostic approaches ('splitters' vs. 'lumpers').
• Identified variables that may elucidate the etiology of these disorders.

Conclusions:

• Addressing comorbidity is essential for advancing psychiatric classification.
• Hierarchical models and feature distinctions can clarify diagnostic complexities.
• Further research into etiological variables is needed for externalizing and internalizing disorders.