Familial aggregation of schizophrenia-spectrum disorders and obsessive-compulsive associated disorders in schizophrenia probands with and without OCD.
A substantial proportion of schizophrenia patients also has obsessive-compulsive disorder (OCD). To further validate the clinical validity of a schizo-obsessive diagnostic entity, we assessed morbid risks for schizophrenia-spectrum disorders and OC-associated disorders in first-degree relatives of schizophrenia probands with and without OCD. Two groups of schizophrenia probands [with OCD (n = 57) and without OCD (n = 60)] and community-based controls (n = 50) were recruited. One hundred eighty two first-degree relatives of probands with OCD-schizophrenia, 210 relatives of non-OCD schizophrenia probands, and 165 relatives of community subjects were interviewed directly [59.3% (108/182), 51.9% (109/210), and 54.5% (90/165), respectively], using the Structured Clinical Interview for Axis-I DSM-IV Disorders and Axis II DSM-III-R Personality Disorders and the remaining relatives were interviewed indirectly, using the Family History Research Diagnostic Criteria. Relatives of OCD-schizophrenia probands had significantly higher morbid risks for OCD-schizophrenia (2.2% vs. 0%; P = 0.033) and OCPD (7.14% vs. 1.90%; P = 0.014), and a trend towards higher morbid risk for OCD (4.41% vs. 1.43%; P = 0.08) compared to relatives of non-OCD schizophrenia probands. When morbid risks for OCD, OCPD, and OCD-schizophrenia were pooled together, the significant between-group difference became robust (13.74% vs. 3.33%; P = 0.0002). In contrast, relatives of the two schizophrenia groups did not differ significantly in morbid risks for schizophrenia-spectrum disorders, mood disorders, or substance abuse disorders. A differential aggregation of OC-associated disorders in relatives of OCD-schizophrenia versus non-OCD schizophrenia probands, provides further support for the validity of a putative OCD-schizophrenia ("schizo-obsessive") diagnostic entity.
Poyurovsky
Michael
M
Research Unit, Tirat Carmel Mental Health Center, Tirat Carmel, Israel. poyurovs@tx.technion.ac.il
Kriss
Victoria
V
Weisman
Gregory
G
Faragian
Sarit
S
Schneidman
Michael
M
Fuchs
Camil
C
Weizman
Abraham
A
Weizman
Ronit
R
D000328:Adult; D015897:Comorbidity; D005192:Family Health; D005260:Female; D006801:Humans; D007557:Israel / Q000453:epidemiology; D008297:Male; D009771:Obsessive-Compulsive Disorder / Q000175:diagnosis* / Q000453:epidemiology / Q000235:genetics; D012559:Schizophrenia / Q000175:diagnosis* / Q000453:epidemiology / Q000235:genetics; D013223:Statistics as Topic