A Registry-Based Twin Study of Depression in Men

Abstract
DEPRESSION IS one of the most common serious psychiatric disorders.1 Numerous approaches have been brought to bear to investigate its etiology. Molecular genetic techniques have been applied,2 but sophisticated approaches have become available only recently, and results have been varied. Also, the probable multifactorial etiology of depression may impede rapid progress in determining the molecular genetic basis for risk. Therefore, traditional genetic epidemiological approaches remain important.