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Cully JA, Graham DP, Stanley MA, Ferguson CJ, Sharafkhaneh A, Souchek J, Kunik ME. Quality of life in patients with chronic obstructive pulmonary disease and comorbid anxiety or depression. Psychosomatics. 2006 Jul 1; 47(4):312-9.
The authors examined 179 veterans with chronic obstructive pulmonary disease (COPD) to determine the relative contribution of clinical depression and/or anxiety (Beck Depression and Beck Anxiety Inventories) to their quality of life (Chronic Respiratory Questionnaire and Medical Outcomes Survey Short Form). Multiple-regression procedures found that both depression and anxiety were significantly related to negative quality-of-life outcomes (anxiety with both mental and physical health quality-of-life outcomes, and depression primarily with mental health). When comorbid with COPD, mental health symptoms of depression and anxiety are some of the most salient factors associated with quality-of-life outcomes.