TY - JOUR
T1 - Self-reported schizotypy and bipolar disorder: demonstration of a lack of specificity of the Kings Schizotypy questionnaire
AU - Heron, Jessica
AU - Jones, Ian
AU - Williams, J
AU - Owen, MJ
AU - Craddock, Nicholas
AU - Jones, Lisa
PY - 2003/12/15
Y1 - 2003/12/15
N2 - Previous studies have demonstrated that schizophrenia patients score highly on self-reported measures of schizotypy such as the Kings Schizotypy Questionnaire (KSQ), but relatively little is known about the specificity of these self-reported features to schizophrenia. We aimed to explore the specificity of schizotypal features to schizophrenia by measuring their prevalence in subjects with bipolar disorder. The Kings Schizotypy Questionnaire (KSQ) was administered to participants (n=92) in a sibling-pair genetic linkage study of bipolar disorder. Scores were compared with those of participants in a similarly designed, concurrent family study of schizophrenia (n=135) and psychiatrically well controls (n=263). The bipolar group had significantly more schizotypal features than controls but significantly less than schizophrenia patients. Whether a bipolar subject had experienced positive psychosis had no effect on his/her schizotypy score. We conclude that elevated self-reported schizotypy as measured by the KSQ is not specific to schizophrenia, and may be associated with functional psychosis in general.
AB - Previous studies have demonstrated that schizophrenia patients score highly on self-reported measures of schizotypy such as the Kings Schizotypy Questionnaire (KSQ), but relatively little is known about the specificity of these self-reported features to schizophrenia. We aimed to explore the specificity of schizotypal features to schizophrenia by measuring their prevalence in subjects with bipolar disorder. The Kings Schizotypy Questionnaire (KSQ) was administered to participants (n=92) in a sibling-pair genetic linkage study of bipolar disorder. Scores were compared with those of participants in a similarly designed, concurrent family study of schizophrenia (n=135) and psychiatrically well controls (n=263). The bipolar group had significantly more schizotypal features than controls but significantly less than schizophrenia patients. Whether a bipolar subject had experienced positive psychosis had no effect on his/her schizotypy score. We conclude that elevated self-reported schizotypy as measured by the KSQ is not specific to schizophrenia, and may be associated with functional psychosis in general.
KW - schizotypy
KW - Kings Schizotypy Questionnaire
KW - bipolar disorder
UR - http://www.scopus.com/inward/record.url?scp=0242636017&partnerID=8YFLogxK
U2 - 10.1016/S0920-9964(03)00004-5
DO - 10.1016/S0920-9964(03)00004-5
M3 - Article
C2 - 14630308
VL - 65
SP - 153
EP - 158
JO - Schizophrenia Research
JF - Schizophrenia Research
IS - 2-3
ER -