UICIDE IS ONE OF THE LEADING causes of death worldwide. As a result, the World Health Organization 1 and the US surgeon general 2 have highlighted the need for more comprehensive data on the occurrence of suicidal thoughts and attempts, according to the assumption that such data would be useful for planning national health care policy, as well as for evaluating efforts to reduce suicide and suicide-related behaviors. The latter are among the official national health objectives in the United States. 3 The assumption that information on suiciderelated behaviors, including thoughts, plans, gestures, and nonfatal attempts, is important for understanding completed suicides can be called into question because only a small fraction of suicide attempters eventually complete suicide. 4 However, suicide attempts are significant predictors of subsequent completed suicide, as well as important in their own right as indicators of extreme psychological distress.Although the National Center for Health Statistics maintains data on all suicide deaths in the United States according to death certificate records, 5 no national data are available on the 1-year prevalence of trends in suicidal thoughts or attempts. Current estimates of such outcomes in the United States are drawn from 2 main sources. First, several ongoing surveillance systems have been established to monitor suicide-related outcomes among nationally representative samples of See also Patient Page.