A suicide attempt is an act in which an individual tries to die by suicide but survives. While it may be described as a "failed" or "unsuccessful" suicide attempt, mental health professionals discourage the use of these terms as they imply that a suicide resulting in death is a successful or desirable outcome. In the United States, the National Institute of Mental Health reports there are 11 nonfatal suicide attempts for every suicide death. The American Association of Suicidology reports higher numbers, stating that there are 25 suicide attempts for every suicide completion. The ratio of suicide attempts to suicide death is about 25:1 in youths, compared to about 4:1 in elderly. A 2008 review found that nonfatal self-injury is more common in women, and a separate study from 2008/2009 found suicidal thoughts higher among females, as well as significant differences between genders for suicide planning and suicide attempts. Suicide attempts are more common among adolescents in developing countries than developed ones. A 12-month prevalence of suicide attempt in developing countries between 2003 and 2015 was reported as 17%. Suicide terminology Without commonly agreed-upon operational definitions, some suicidology researchers regard many suicide attempts as parasuicide (para- meaning near) or self harm behavior, rather than "true" suicide attempts, as in lacking suicidal intent. Some suicide methods have higher rates of lethality than others. The use of firearms results in death 90% of the time. Wrist-slashing has a much lower lethality rate, comparatively. 75% of all suicide attempts are by drug overdose, a method that is often thwarted because the drug is nonlethal, or is used at a nonlethal dosage. These people survive 97% of the time. A nonfatal suicide attempt is the strongest known clinical predictor of eventual suicide. Suicide risk among self-harm patients is hundreds of times higher than in the general population. It is often estimated that about 10–15% of people who attempt suicide eventually die by suicide.