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The Measurement Invariance of Schizotypy in Europe

Published online by Cambridge University Press:  16 April 2020

E. Fonseca-Pedrero ,
J. Ortuño-Sierra ,
G. Sierro ,
C. Daniel ,
M. Cella ,
A. Preti ,
C. Mohr  and
O.J. Mason
E. Fonseca-Pedrero*
Affiliation:
Department of Educational Sciences, University of La Rioja, Spain Prevention Program for Psychosis (P3), Spain
J. Ortuño-Sierra
Affiliation:
Department of Educational Sciences, University of La Rioja, Spain
G. Sierro
Affiliation:
Institute of Psychology, University of Lausanne, Switzerland
C. Daniel
Affiliation:
Research Department of Clinical, Educational and Health Psychology, University College London, UK
M. Cella
Affiliation:
Department of Psychology, Institute of Psychiatry, Psychology & Neuroscience, King's College London, UK
A. Preti
Affiliation:
Center of Liaison Psychiatry and Psychosomatics, University Hospital, University of Cagliari, Italy, and Centro Medico Genneruxi, Cagliari, Italy
C. Mohr
Affiliation:
Institute of Psychology, University of Lausanne, Switzerland
O.J. Mason
Affiliation:
Research Department of Clinical, Educational and Health Psychology, University College London, UK
*
*Corresponding author. E-mail address: eduardo.fonseca.pedrero@gmail.com (E. Fonseca-Pedrero).
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Abstract

The short version of the Oxford-Liverpool Inventory of Feelings and Experiences (sO-LIFE) is a widely used measure assessing schizotypy. There is limited information, however, on how sO-LIFE scores compare across different countries. The main goal of the present study is to test the measurement invariance of the sO-LIFE scores in a large sample of non-clinical adolescents and young adults from four European countries (UK, Switzerland, Italy, and Spain). The scores were obtained from validated versions of the sO-LIFE in their respective languages. The sample comprised 4190 participants (M = 20.87 years; SD = 3.71 years). The study of the internal structure, using confirmatory factor analysis, revealed that both three (i.e., positive schizotypy, cognitive disorganisation, and introvertive anhedonia) and four-factor (i.e., positive schizotypy, cognitive disorganisation, introvertive anhedonia, and impulsive nonconformity) models fitted the data moderately well. Multi-group confirmatory factor analysis showed that the three-factor model had partial strong measurement invariance across countries. Eight items were non-invariant across samples. Significant statistical differences in the mean scores of the s-OLIFE were found by country. Reliability scores, estimated with Ordinal alpha ranged from 0.75 to 0.87. Using the Item Response Theory framework, the sO-LIFE provides more accuracy information at the medium and high end of the latent trait. The current results show further evidence in support of the psychometric proprieties of the sO-LIFE, provide new information about the cross-cultural equivalence of schizotypy and support the use of this measure to screen for psychotic-like features and liability to psychosis in general population samples from different European countries.

Keywords

SchizotypySchizotypalInvarianceEquivalenceCross-culturalsO-LIFE
Type
Original article
Information
European Psychiatry , Volume 30 , Issue 7 , October 2015 , pp. 837 - 844
Copyright
European Psychiatric Association 2015

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