Finally, two articles discuss how depression and other mental illnesses affect—and are affected by—various quality-of-life and risk variables. Tara W. Strine, M.P.H., and her colleagues note that emotional states influence a person's assessment of his or her ability to adopt and maintain health-enhancing behaviors and therefore influence vulnerability to illness. These authors used nationally representative data from the Behavioral Risk Factor Surveillance System to examine health-related quality of life and behaviors among noninstitutionalized individuals who reported a primary mental health impairment compared with those who reported a primary physical health impairment and those who reported no impairment (see page 1408). In another article, Menahem I. Krakowski, M.D., Ph.D., and Pal Czobor, Ph.D., studied a sample of psychiatric inpatients to assess relationships between suicide attempts and other violent behaviors and various psychosocial problems, such as history of head trauma, harsh parental discipline, parental psychopathology, truancy, and foster home placement (see page 1414).