In the Western U.S., Considering the Altitude-Suicide Relationship
Suicide is one of the top 10 causes of death in the U.S. In the next 20 years, it’s expected to cause more than 2 million deaths per year worldwide, ranking 14th in the world as a cause of death.
There are many factors known to affect an individual’s risk for suicide. For example, people who are older, male, white, divorced, low-income, isolated, or who abuse substances are all at higher risk. Psychiatric illness, mood disorders, and lack of social support are also recognized risk factors.
Several studies have demonstrated geographic variations in suicide patterns in the U.S., with higher suicide rates in western states. Our ongoing research expands on those findings, showing that Americans who live in higher-altitude counties are at a higher risk for suicide.
Increased elevation has been known to have a protective relationship with certain medical illnesses. For example, people who live at higher altitudes are somewhat less likely to die from coronary artery disease or stroke. But increased elevation may also enhance psychological problems, such as panic attacks.
Previous studies have reported a significant association between suicide and altitude. One study showed a strong positive relationship between average state altitude and suicide rate. For example, in Utah, the average geographic altitude is about 6,000 feet, and the rate of suicide is 70 percent higher than average.
Another, similar study showed that higher-altitude states had significantly higher suicide rates than lower-altitude states. Similar findings were observed for both firearm-related and nonfirearm-related suicides.
These studies suggest altitude is a significant risk factor for depressive symptoms and suicide. However, average state altitude doesn’t provide a very close look at the relationship between suicide and altitude. Altitude could vary widely across the state, so the average may not properly represent the elevation for each place.
As part of an ongoing project, our lab has examined all 3,064 contiguous U.S. counties with average county elevation to access whether there is a significant association between suicide and altitude.
Looking at average altitude for county, rather than center of county or state, would better represent the elevation for each place. We calculated the average elevation based on the total number of 30-meter by 30-meter grids in each county.
We looked at suicide data from the National Center for Health Statistics for every U.S. county between 2008 and 2014. Calculations for average county latitude came from the U.S. Geologic Survey. Alaska and Hawaii were not included in our analysis, because digital altitude information was not fully available.
We found that, for every increase of 100 meters in altitude, suicide rates increase by 0.4 per 100,000.
Counties with higher-than-average suicide rates also tended to have a lower percent of African-American residents, a higher percent of people 65 years or older, a higher percent of smokers and lower scores for family and social support.
Our findings suggest a need for further investigation into the extent by which altitude may serve as a triggering factor for suicide. This could have major implications in how medical professionals understand the causes of suicide.
We controlled for multiple socioeconomic, demographic, and clinical factors, such as unemployment rate and the ratio of population to primary care physicians. This did not change our findings. In other words, this novel finding is not explained by county differences in socioeconomic and demographic factors.
Why might counties at higher altitudes — primarily observed in the western region of the country — be more likely to have higher suicide rates? One reasonable explanation could be the effects of hypoxia, or a deficiency in the amount of oxygen reaching the tissues. This can influence the body’s metabolism of serotonin, one of the neurotransmitters related to aggressive behavior and suicide. Several studies suggest that chronic hypoxia increases mood disturbances, especially in patients with emotional instability.
However, without further clinical study, it is difficult to pin down exactly what biological mechanism is affected by altitude.
Hoehun Ha is assistant professor of geography at Auburn University at Montgomery.
This article was originally published on The Conversation. Read the original article.
I looked into this for my thesis in 2014 and have presented my research at both the American Association of Suicidology and International Association for Suicide Prevention conferences. Here is the link if you’d like to learn more about what my findings were and why I believe altitude plays a part–but is not the sole cause–of the problem.
Despite the author’s analysis, there is not a single argument given in the article to support the claim. Author has have shown that data that how the number of suicide in different regions taking place. That is the fact which presented by the author, and fact cannot be the reason for some act(suicide). Suicide has altogether different reasons. It author want to prove that it is because altitude, the author need to analyze scientifically and convince his argument rather the than simply putting data and concluding. It will be unscientific science. It seems that while putting suicide is beyond human to something out of human control(geographical location), the author is giving a support to the ignorant state/ruling class which is unable to solve the many problems which people are facing.
As long as the studies took place, it is still an article worth reading. Why take exception to it based on a preference for one type of propaganda over another ? Having a history of low moods and some oxygen starvation due to previous respitory illness, I have no trouble accepting the premise of this article.