Subjective social status, objective social status, and substance use among individuals with serious mental illnesses.

Subjective social status (SSS) and objective socioeconomic status (OSS) may appear to be similar social determinants of mental health, but are actually independently associated with diverse health outcomes including substance use and substance use disorders (SUDs). Such associations have not been examined among individuals with serious mental illnesses (SMI) despite their high prevalence of comorbid substance use; frequent treatment and recovery complications associated with such use; and high levels of economic disadvantage, discrimination, and inequities in this marginalized population. These psychosocial adversities manifest as poor mental illness outcomes, poor physical health, and early mortality in populations with SMI. We hypothesized that both SSS and OSS would predict substance use severity and SUD diagnoses in 240 patients with SMI. SSS, measured by the MacArthur Scale of Subjective Social Status, was unassociated with a composite measure of income and education used to operationalize OSS. Additionally, SSS and OSS were differentially associated with various types of substance use disorders. Only OSS was associated with whether individuals smoked cigarettes, or the level of nicotine dependence. Conversely, only SSS was associated with drug use severity. Our results shed light on the potential for differential impacts of SSS and OSS among persons with SMI.