PROJECT SUMMARY PAR-22-172 Mental Health Research Dissertation Grant to Enhance Workforce Diversity (R36): Transgender and/or nonbinary (TNB) college students (those whose gender is incongruent with their sex assigned at birth) are at substantially higher risk for mental health concerns (e.g. suicidality, depression) than their cisgender peers (whose gender aligns with sex assigned at birth). Students of color and students of lower socioeconomic status (SES) similarly experience disparities in mental health outcomes. However, no quantitative studies of TNB college students have examined mental health outcomes across intersecting social positions of gender identity, race/ethnicity, and SES, a notable gap in mental health equity research. Additionally, while a growing body of literature connects state-level protective policies with improved TNB mental health, little research has examined the role of TNB-supportive campus policies (e.g. insurance coverage for gender affirming healthcare, TNB-competent counseling training) in TNB student mental health. Further, no studies have investigated the impact of these policies collectively. In light of an increasingly anti-TNB sociopolitical climate in the US and the aforementioned scientific gaps, further research on protective policy environments for TNB students across intersecting social positions is urgently needed. To address these gaps, this project will draw on Intersectionality, Minority Stress, and Ecosocial frameworks. Leveraging data from the largest national study of US college mental health, the Healthy Minds Study, including new data on TNB-supportive campus policies from 323 campuses, this project's objective is to use rigorous social epidemiologic methods to examine the role of TNB-supportive campus policy environments in intersectional TNB mental health disparities. The project's aims are to: 1) estimate mental health outcomes (depression and suicidality) across intersectional groups defined by gender, race/ethnicity, and SES; 2) empirically categorize campuses into distinct classes of TNB-supportive policy environments; 3) characterize the degree to which policy environments impact TNB mental health outcomes across intersectional groups of race/ethnicity and SES. These aims are consistent with priorities stated in the NIMH Strategic Plan (Goal 4 Objective 4.3) and the NIH FY 2021–25 Strategic Plan to Advance Research on the Health & Well-Being of Sexual & Gender Minorities. The project is innovative in its novel application of quantitative intersectional methods to advance health equity in TNB mental health research. The proposed project is significant in that it will generate a nuanced understanding of the role of TNB-supportive campus policy environments in college student mental health across intersecting social positions, with the goal of informing campus policy interventions to improve TNB mental health. Support for this project would lay the groundwork for future studies in the invest...