The relationship among major depression only, major depression with
anxiety disorders, and anxiety disorders only was investigated in a twin
sample (N = 177 pairs). The results suggest that there is an etiological
relationship between mixed major depression-anxiety disorders and major
depression only but no relationship between these two conditions and
anxiety disorders only. When anxiety disorders with panic attacks were
analyzed, the relationship between mixed cases and major depression only
and the lack of a relationship between mixed cases, major depression only,
and anxiety disorders only became even clearer. Furthermore, mixed cases
seemed to be more strongly influence by genetic factors than was major
depression only.
Abstract Teaser