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  • Title: Follow-up factor structure of schizotypy and its clinical associations in a help-seeking sample meeting ultra-high risk for psychosis criteria at baseline.
    Author: Lin A, Wigman JT, Nelson B, Wood SJ, Vollebergh WA, van Os J, Yung AR.
    Journal: Compr Psychiatry; 2013 Feb; 54(2):173-80. PubMed ID: 22901838.
    Abstract:
    BACKGROUND: Schizotypy is a multidimensional construct indexing psychometric risk for schizophrenia. This study investigated the factor structure and clinical associations of the Oxford-Liverpool Inventory of Feelings and Experiences (O-LIFE) short scales, assessed at follow-up in an originally help-seeking sample identified as ultra-high risk for psychosis. METHOD: Participants were 228 help-seeking individuals identified as ultra-high risk for psychosis between 2 and 14 years previously (mean, 7.09; SD, 3.17; median, 6.41). The 43-item O-LIFE short scales (Unusual Experiences, Introvertive Anhedonia, Cognitive Disorganization, Impulsive Nonconformity) and indices of depression, anxiety, positive and negative psychotic symptoms, functioning, and quality of life were administered at follow-up. Structural equation modeling was used. RESULTS: Impulsive Nonconformity was shown to be an unstable factor and was excluded. A 3-factor model of Unusual Experiences, Cognitive Disorganization, and Introvertive Anhedonia was found to be the best description of the data, compared with a 1-factor model. Unusual Experiences factor was associated with positive psychotic symptoms; Cognitive Disorganization was associated with depression and anxiety; and Introvertive Anhedonia was associated with positive and negative psychotic symptoms, quality of life, and functioning. CONCLUSIONS: The Impulsive Nonconformity factor of the O-LIFE short scales should be interpreted with caution. A well-fitting 3-factor model provides support for a dimensional structure in schizotypy that is similar to that of schizophrenia. Separate dimensions were differentially associated with psychopathology, functioning, and quality of life. The interpersonal dimension of schizotypy was the only dimension associated with poorer functioning and quality of life and may be a sensitive indicator of need for care.
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