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. 1993 Apr;87(4):279-84.
doi: 10.1111/j.1600-0447.1993.tb03372.x.

The distinction of bipolar II disorder from bipolar I and recurrent unipolar depression: results of a controlled family study

R Heun  1 , W Maier
Affiliations

The distinction of bipolar II disorder from bipolar I and recurrent unipolar depression: results of a controlled family study

R Heun et al. Acta Psychiatr Scand. 1993 Apr.

Abstract

The aim of the study was to differentiate bipolar II, bipolar I and recurrent unipolar depression by their familial load for affective disorders. Eighty bipolar, 108 unipolar, 80 control subjects and interviewed first-degree relatives were diagnosed according to Research Diagnostic Criteria using the Schedule for Affective Disorders and Schizophrenia--lifetime version. The morbid risks for bipolar I disorder were equivalent in relatives of bipolar I (3.6%) and bipolar II (3.5%) subjects and lower in relatives of unipolar subjects (1.0%). The morbid risks of relatives for bipolar II disorder distinguished bipolar II subjects (6.1%) from bipolar I subjects (1.8%), from unipolar depressives (0.3%) and from controls (0.5%). To promote further evaluation, bipolar II disorder should be included in DSM-IV as a distinct diagnostic category.

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