Reliability and validity of two Likert versions of the Schizotypal Personality Questionnaire (SPQ) Viviana Wuthrich * , Timothy C. Bates Macquarie Centre for Cognitive Science, Macquarie University, Sydney, NSW 2109, Australia Received 27 January 2004; received in revised form 15 July 2004; accepted 23 September 2004 Available online 30 November 2004 Abstract Two alternative formats of the Schizotypal Personality Questionnaire (SPQ: Raine, 1991) were com- pared to examine if a Likert format in which SPQ items could be interleaved with other personality mea- sures would promote reporting of symptoms. The Likert versions correlated highly with the standard SPQ (0.88–0.94) and showed better internal reliability compared to the standard version in which three subscales had Cronbach a < 0.70. The Likert versions also identified additional high scorers missed by the standard version and so may be desirable when testing relatives of patients with schizophrenia. Norms for the new version administered to 834 subjects are provided. Ó 2004 Elsevier Ltd. All rights reserved. Keywords: SPQ; Schizotypy; Schizotypal Personality Disorder; Validity; Schizotypal Personality Questionnaire 1. Introduction The Schizotypal Personality Questionnaire (SPQ: Raine, 1991) is a 74 item self-report question- naire measuring the nine diagnostic criteria of the DSM-III-R (American Psychiatric Association, 1987) Schizotypal Personality Disorder (SPD): odd speech, odd behaviour, unusual perceptual experiences, paranoia, no close friends, constricted affect, magical thinking, social anxiety, ideas 0191-8869/$ - see front matter Ó 2004 Elsevier Ltd. All rights reserved. doi:10.1016/j.paid.2004.09.017 * Corresponding author. Fax: +61 2 9850 6059. E-mail address: viviana@maccs.mq.edu.au (V. Wuthrich). www.elsevier.com/locate/paid Personality and Individual Differences 38 (2005) 1543–1548