Psychometric properties of the Personal State Questionnaire in a Catalan sample M.A. Fullana*, X. Caseras, R. Torrubia Unitat de Psicologia Me`dica, Departament de Psiquiatria i de Medicina Legal, Facultat de Medicina, Universitat Auto`noma de Barcelona, 08193 Bellaterra, Barcelona, Catalonia, Spain Received 25 July 2001; received in revised form 18 December 2001; accepted 21 January 2002 Abstract In the present study the psychometric properties of the Catalan version of Brebner’s Personal State Questionnaire (PSQ) were investigated in a sample of 280 college students. The PSQ showed a high internal consistency and a single factor structure. Concurrent validity analyses conducted using the Eysenck Per- sonality Questionnaire (EPQ), the Positive and Negative Affect Schedule (PANAS) and the Sensitivity to Punishment and Sensitivity to Reward Questionnaire (SPSRQ) showed results consistent with theory. The best predictor of happiness was positive affect. Our results suggest that the PSQ is a valid and reliable measure of happiness and that it could be useful for research into this construct. # 2002 Elsevier Science Ltd. All rights reserved. Keywords: Happiness; Personality; Assessment In recent years the interest in happiness has grown and a number of experimental investigations on this topic have been carried out (see Brebner, 1998), thus prompting the need for reliable and valid measures of the construct. Happiness has often been assessed by means of visual analogue scales (VAS) but recently more specific measures have been made available. These include the Oxford Happiness Inventory (OHI; Argyle, Martin, & Crossland, 1989) and the Personal State Questionnaire (PSQ; Brebner, & Martin, 1995). The PSQ is a 37-item questionnaire which was developed by Brebner ‘‘as an attempt to evaluate the importance for people’s current affective states of lasting effects, such as physical and mental health status, and recent events, which provide a record of reinforcement, such as enjoying novel 0191-8869/03/$ - see front matter # 2002 Elsevier Science Ltd. All rights reserved. PII: S0191-8869(02)00033-8 Personality and Individual Differences 34 (2003) 605–611 www.elsevier.com/locate/paid * Corresponding author. Tel.: +34-93-581-1223; fax: +34-93-581-1435. E-mail address: mafr@copc.es (M.A. Fullana).