Aim : To investigate the prevalence and clinical correlates of olfactory hallucinations (OHs) in schizophrenia. Methodology : Two pre-existing research datasets were examined. Dataset 1 contained 266 cases (105 males, 52 females) with numeric ratings on the Scales for Assessment of Positive and Negative Symptoms of Schizophrenia (SAPS and SANS) drawn from individual datasets collected for research purposes by SVC or RL. Dataset 2 contained Present State Examination, 9th Edition (PSE-9), categorical codes from a cohort of 1379 patients interviewed for the World Health Organization Study on Determinants of Outcome of Severe Mental Disorders (WHO 10-Country Study: Jablensky et al., 1992). Principal components analysis (PCA) was used to examine the factor structure of the SAPS/SANS items from Dataset 1, excluding low prevalence items, including OHs. Logistic and linear regression techniques were then used to identify predictors of the presence and the severity of OHs. Results : In Dataset 1, visual/verbal hallucinations, a factor comprising persecutory and loss of boundary delusions and a somatic factor combined as significant independent predictors of both the presence and the severity of OHs. Logistic regression analyses conducted on the categorical PSE-9 codes from Dataset 2 yielded a similar pattern of results. Conclusions : Findings suggest that both top-down and bottom-up processes contribute to the genesis of OHs in schizophrenia.
|Number of pages||1|
|Journal||Australian and New Zealand Journal of Psychiatry|
|Issue number||Suppl. 2|
|Publication status||Published - 2006|
|Event||Australasian Schizophrenia Conference - Freemantle, Westeren Australia|
Duration: 21 Aug 2006 → 23 Aug 2006