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Adolescence and emerging adulthood are key developmental stages with high risk for trauma exposure and the development of mental and substance-use disorders (SUDs). This study aims to compare the clinical profiles of adolescents (aged 12–17 years) and emerging adults (aged 18–25 years) presenting for treatment of posttraumatic stress disorder (PTSD) and SUD.

Data was collected from the baseline assessment of individuals (n = 55) taking part in a randomized controlled trial examining the efficacy of an integrated psychological therapy for co-occurring PTSD and SUDs (PTSD+SUD) in young people.

Both age groups demonstrated complex and severe clinical profiles, including high-frequency trauma exposure, and very poor mental health reflected on measures of PTSD, SUD, suicidality and domains of social, emotional, behavioral and family functioning. There were few differences in clinical characteristics between the two groups.

Similarity between the two groups suggests that the complex problems seen in emerging adults with PTSD + SUD are likely to have had their onset in adolescence or earlier and to have been present for several years by the time individuals present for treatment.

To the best of the authors’ knowledge, this is the first study to compare the demographic and clinical profiles of adolescents and emerging adults with PTSD + SUD. These findings yield important implications for practice and policy for this vulnerable group. Evidence-based prevention and early intervention approaches and access to care are critical. Alongside trauma-focused treatment, there is a critical need for integrated, trauma-informed approaches specifically tailored to young people with PTSD + SUD.

This study aims to follow a rigorous approach to identify, critically analyze and synthesize 75 papers published from 2000 to 2022.

The study presents a systematic literature review on identity expressiveness (IE), clarifying and expanding what is currently known about the concept.

To synthesize current knowledge on IE, the study uses the overarching framework of antecedents-phenomenon-consequences, using this same framework to identify gaps and future research directions. The findings show individual and brand-related factors such as the need for uniqueness and anthropomorphism as antecedents of IE, and eWOM/WOM, impulse purchases and upgrading to more exclusive lines as consequences of IE.

The study contributes to theory by synthesizing and mapping current understanding of the state of knowledge on the concept of IE while highlighting gaps in the extant literature and paving future research directions for scholars in the field.

The study offers useful insights for practitioners, broadening marketers’ actionable options in identity-based marketing. Marketers can use insights from this study to inform marketing strategy and communication campaigns for different types of brands.

To the best of the authors’ knowledge, this study is the first of its kind and offers an integrative review of the current literature on IE, thus enhancing understanding of the concept, its antecedents and consequences. The study also contributes to knowledge by highlighting future research priorities for researchers in this field of enquiry.