Familial syndrome patterns in XXXX , schizoaffective disorder, mania, and depression.

@entity1 @entity2795 @entity146 @entity1316 @entity161
A major problem with studies in the field of quantitative genetics is that of phenotypical heterogeneity. In particular, such heterogeneities show up in @entity146 investigations: index cases often tend to display more severe forms of disorders than the respective affected relatives. The principal goal of the present investigation was to test the phenotypical equivalence of the two populations of index cases and their affected relatives. Our analyses were based on 269 hospitalized @entity1 with functional psychoses and 350 affected first degree relatives. As opposed to the majority of earlier investigations in which phenotypes were uniquely defined by diagnoses, phenotypes were represented in this study by a list of 22 @entity146 syndromes. Accordingly, multivariate statistical procedures were applied to analyze the intrinsic properties of the empirical lists. The results showed that @entity2795 patterns clearly appeared in both populations and that the phenotypical equivalence of the corresponding population sample sets lay between satisfactory and good. Furthermore, it was possible to select phenotypically homogeneous and reproducible subsets on the basis of the 22 syndromes. These subgroups can be used as basic material to study the genetic modes via current models from quantitative genetics. Nevertheless, our analyses revealed no clear breeding true of either @entity1316 or @entity161 .
