The present study examined associations among dimensions of suicidality and psychopathology in a sample of 428 homeless adolescents (56.3% female). Confirmatory factor analysis results provided support for a three-factor model in which suicidality (measured with lifetime suicidal ideation and suicide attempts), internalizing disorders (assessed with lifetime diagnoses of major depressive episode and post-traumatic stress disorder), and externalizing disorders (indicated by lifetime diagnoses of conduct disorder, alcohol abuse, and drug abuse) were positively intercorrelated. The findings illustrate the utility of a dimensional approach that integrates suicidality and psychopathology into one model.
KeywordsPsychopathology; Suicidality; Internalizing; Externalizing; Homeless adolescents Dimensions of adolescent suicidality and psychopathology are of increased concern to clinicians and researchers (Bridge et al. 2006;Verona et al. 2004). This interest can be attributed to the relatively high prevalence of adolescent suicidal ideation and suicide attempts (Evans et al. 2005) and to suicide being the third leading cause of death among youths ages 15-24 in the USA (Hoyert et al. 2006). Research also indicates both suicidal ideation and suicide attempts increase the risk for completed suicide (Brown et al. 2000). This pattern of increased liability for suicide risk has led to a broader conceptualization of a suicide spectrum ranging from suicidal ideation to attempted and completed suicide (Lewinsohn et al. 1996).Moreover, psychiatric disorders are among the strongest correlates of adolescent suicidality (Bridge et al. 2006). Mood disorders are robust correlates, but post-traumatic stress disorder, conduct disorder, and substance use disorders are also associated with suicidality (Bridge et al. 2006;Evans et al. 2004). Krueger (1999), informed by the work of Achenbach (Achenbach and McConaughy 1997), developed a dimensional model of psychopathology and clustered psychiatric diagnoses into internalizing and externalizing disorders. As specific psychiatric disorders from both clusters are related to suicidal ideation and attempts, there is interest in linking the suicide spectrum to these broader dimensions of psychopathology (Hills et al. 2005;Verona et al. 2004).Our study expands on this work by including the internalizing and externalizing dimensions of psychopathology in a structural model of adolescent suicidality using a sample of homeless adolescents. Suicidality is measured with lifetime suicidal ideation and suicide attempts, internalizing psychopathology with lifetime diagnoses of major depressive episode and posttraumatic stress disorder, and externalizing psychopathology with lifetime diagnoses of conduct disorder, alcohol abuse, and drug abuse. We use confirmatory factor analysis to examine covariances among dimensions of suicidality, internalizing, and externalizing disorders.
Internalizing and Externalizing DisordersAchenbach used an empirical approach to derive two broad dimensions (internalizing...