Experts said the new study may help one long tarnished to clarify relationship between suicide and economic development.
While many researchers that have argued economic hardship can increase the likelihood of suicide in people who are already vulnerable - such as those with depression or other mental illnesses - having research has been mixed. Some studies have supported such a link, but others have found the opposite: that prices in times of high unemployment, as if people have integrity, when they need it most.
With more comprehensive data, economic trends, nail down, the new study found a clear correlation between suicide rates and of the economic cycle in young and middle age adults. This correlation disappeared as a researcher on children and the elderly. It may not the case, which cause economic difficulties suicide attempts, but they can be factors.
"they have a nice job add a piece of a very complex puzzle," said Eve Moscicki, a researcher at the American Psychiatric Institute for research and education, which was not involved in the investigation. "It may be that in humans, which are more prone to suicide to lose a job or receive a reduction in pay, it adds an additional stressor."
In the study, which appears in the American Journal of public health centers for disease control and prevention investigated suicide rates per 100,000 Americans each year from 1928 to 2007 researchers at the Federal Republic.
The overall rate dropped by more than one-third in this time of 11.2 of 18.0, with most of the decline before 1945. Fluctuated in the mid-1950s, tended upward until the late 1970s, and back down from the mid-1980s until 2000. In the years improved access to care, rising standards of living have this general downward trend researchers and better drugs, attributed to among other things.
To determine the effect of economic cycles, the average rate calculated period as the economy responsible researchers and compared with the average in the years to the downturn. The sharpest increase came at the beginning of the great depression, when prices jumped 23 percent - on 22.1 1932 of 18.0 1928. The study found small bumps during the oil crisis at the beginning of the 1970s and the double-dip recession of the early 1980's, among others economic troughs.
The suicide rate dropped in General in times of economic expansion, with some exceptions. While the 1960s boom went among the people in the 1930s and 1940s and actually decreased in the elderly in the severe recession of the mid-1970s.
Cultural factors played a role, the authors argue. "The social unrest and turmoil of the 1960s have added youth mental stress and contributed to their ever-increasing rates of suicide," she wrote. "For the older group, the rapid increase in the benefits of social security in the late 1960's a safety net may have been in difficult times."
Feijun Luo, the main author of the study, said, "the findings suggest the potential, you will find a large increase during this current recession under before." His co-authors were Curtis S. Florence, Myriam Quispe-Agnoli, Yantai Ouyang and Dr. Alexander E. Crosby, all of the C.D.C.
Suicide is impossible to predict, and rarely even in the most dire, so prevention programmes and early treatments had mixed results. The most address specific problems such as drug abuse, depression, isolation and difficult family relationships. But this study communities and doctors should be a better feeling not only if risk is high, but where - working-age adults, in this case.
"Once people age of the workforce, it seems no relationship between the business cycle and their vulnerability," said Dr. Florence.
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