A statistical modeling study suggests that problems with alcohol abuse may lead to an increased risk of depression, as opposed to the reverse model in which individuals with depression self-medicate with alcohol, according to a report in the March issue of Archives of General Psychiatry.
A number of epidemiological studies have shown that alcohol abuse or dependence is associated with major depression, according to background information in the article. However, it has previously been unclear whether one disorder causes the other, or whether a common underlying genetic or environmental risk factor increases risk for both.
Using data gathered from a 25-year study of health and development in New Zealand, David M. Fergusson, Ph.D., and colleagues at the Christchurch School of Medicine and Health Sciences, University of Otago, Christchurch, New Zealand, examined the associations between alcohol abuse and depression. A sample of 1,055 participants born in 1977 were assessed for both conditions at ages 17 to 18, 20 to 21 and 24 to 25 years and also asked questions about lifestyle and demographic factors.
At ages 17 to 18, 19.4 percent of the participants met criteria for alcohol problems and 18.2 percent for major depression; at ages 20 to 21, 22.4 percent had alcohol disorders and 18.2 percent major depression; and at age 24 to 25, 13.6 percent met alcohol disorder criteria and 13.8 percent had major depression. At all ages, alcohol abuse or dependence was associated with an increased risk of major depression-those who fulfilled criteria for alcohol abuse or dependence were 1.9 times more likely to also fulfill criteria for major depression.