Although not without important limitations (see below), these findings provide, for the first time, a view of the etiological structure of a substantial proportion of common psychiatric disorders. Furthermore, this structure, especially the genetic factors, is coherent and clinically sensible. The structure of the genetic risks for these disorders is neither extremely simple (e.g., just one dimension of underlying risk) nor bewilderingly complex. Of the many interesting results from these analyses, three are particularly noteworthy.
