School racial composition and race/ethnic differences in early adulthood health

► Black youth in predominately white schools report poorer early adult health than white youth. ► Asian youth in predominantly minority schools report poorer early adult health than white youth. ► School attachment, loneliness, and parent support in adolescence are independently associated with adult health. ► Discrimination does not mediate school racial composition effects on black and Asian health. ► School racial composition and in-school social dynamics have consequences for health in early adulthood.