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The British Journal of Psychiatry (2002) 180: 45-50
© 2002 The Royal College of Psychiatrists

Signs and Symptoms of Psychotic Illness (SSPI): a rating scale

PETER F. LIDDLE, MRCPsych

ELTON T.C. NGAN, FRCP(C)

Department of Psychiatry, University of British Columbia, Canada

GARY DUFFIELD, MRCPsych and KING KHO, MRCPsych

Ealing Hospital, London

ANTHONY J. WARREN, MRCPsych

Graylingwell Hospital, Sussex, UK

Correspondence: Professor Peter F. Liddle, Division of Psychiatry, University of Nottingham, Queen's Medical Centre, Nottingham NG7 2UH, UK. E-mail: peter.liddle{at}nottingham.ac.uk

Declaration of interest None.

Background In the rating scales commonly used for assessing response to antipsychotic treatment, individual items embrace symptoms that apparently arise from distinguishable pathophysiological processes and might be expected to respond differently to treatment.

Aims To test the reliability, sensitivity to change and factor structure of a new scale for the assessment of the Signs and Symptoms of Psychotic Illness (the SSPI).

Method Interrater reliability was evaluated by determining the intraclass correlation for the ratings of 63 patients. Sensitivity to change was assessed in a longitudinal study of 33 patients. Factor structure was determined from scores for 155 patients.

Results The intraclass correlation was satisfactory for all individual items and excellent for the total score. Scores were sensitive to change. A change in Clinical Global Impression of one unit corresponded to an SSPI total score change of 31%. Factor analysis revealed five clusters of symptoms.

Conclusions The SSPI provides a sensitive and reliable measure of the five major clusters of symptoms that occur commonly in psychotic illness.


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