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Hallucinatory experiences and onset of psychotic disorder: evidence that the risk is mediated by delusion formation
Author(s) -
Krabbendam L.,
MyinGermeys I.,
Hanssen M.,
Bijl R. V.,
De Graaf R.,
Vollebergh W.,
Bak M.,
Van Os J.
Publication year - 2004
Publication title -
acta psychiatrica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.849
H-Index - 146
eISSN - 1600-0447
pISSN - 0001-690X
DOI - 10.1111/j.1600-0447.2004.00343.x
Subject(s) - delusion , psychology , psychosis , psychiatry , schizophrenia (object oriented programming) , clinical psychology , delusional disorder , population , thought disorder , medicine , environmental health
Objective: To examine the hypothesis that the risk for onset of psychotic disorder in individuals with self‐reported hallucinatory experiences (HE) would be higher in those who developed delusional ideation (DE) than in those who did not. Method: A population sample of 4673 individuals were interviewed with the Composite International Diagnostic Interview at baseline and 1 and 3 years later. At year 3, clinical re‐interview took place to identify onset of psychotic disorder. Results: Given the presence of HEs at baseline, the increase in risk of having the psychosis outcome at year 3 was much higher in those with DE at year 1 than in those without DE (risk difference between individuals with and without DE: 18.72%, 95% CI: 2.22–35.23, χ 2 = 4.94, df = 1, P = 0.026). Conclusion: The results are in line with current psychological theories stating that clinical outcome of psychosis‐like experiences is related to the development of secondary beliefs and appraisals.