Correlates of delusion-like experiences in a non-psychotic community sample.
OBJECTIVE
Several large population-based studies have reported that otherwise-well individuals endorse items related to delusion-like experiences. The aim of the present study was to examine selected correlates of delusion-like experiences in a sample of non-psychotic individuals.


METHODS
Subjects (n=310) were screened with the Diagnostic Interview for Psychosis in order to exclude psychotic disorders. Delusion-like experiences were assessed with the Peters Delusional Inventory (PDI). Non-parametric statistics were used to assess the relationship between total PDI score and a range of demographic (age, sex, migrant status, paternal age), physical (minor physical anomalies) symptom-related variables (hallucinations, awareness of thought disorder) and family history of mental illness.


RESULTS
The median (range) PDI score was 4 (0-26), while one-third of the subjects endorsed seven or more items. The presence of a family history of any psychiatric condition was significantly correlated with a higher PDI score. PDI score was significantly positively correlated with endorsement of hallucinations and awareness of thought disorder. PDI was not significantly associated with sex, family history of schizophrenia, paternal age, migrant status nor scores related to minor physical anomalies. There was a trend level association between younger age and higher PDI score.


CONCLUSIONS
Delusion-like experiences are relatively common in non-psychotic individuals. The association with a family history of mental disorders provides clues to the mechanisms underlying the profile of delusion-like experience.
Varghese
Daniel
D
Department of Psychiatry, Princess Alexandra Hospital, Woolloongabba, Queensland, Australia.
Scott
James
J
McGrath
John
J
D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D001315:Australia / Q000453:epidemiology; D016022:Case-Control Studies; D003702:Delusions / Q000453:epidemiology* / Q000523:psychology*; D005260:Female; D020022:Genetic Predisposition to Disease / Q000523:psychology; D006306:Health Surveys; D006801:Humans; D008297:Male; D008875:Middle Aged; D010331:Paternal Age; D012111:Residence Characteristics / Q000706:statistics & numerical data; D012307:Risk Factors; D017678:Sex Distribution; D011795:Surveys and Questionnaires; D014171:Transients and Migrants / Q000523:psychology / Q000706:statistics & numerical data