Psychometric properties of the Positive and Negative Syndrome Scale (PANSS) in schizophrenia

We analyzed the psychometric properties of the Positive and Negative Syndrome Scale (PANSS) in a sample of 100 DSM-III-R schizophrenic patients. Our findings coincided with the results of Kay's group in the following points: (1) the PANSS scores were normally distributed; (2) the positive and negative scales showed good interrater reliability; (3) positive and negative syndromes are independent constructs; (4) the positive and negative scales held a high concurrent validity in relation to the Scale for the Assessment of Positive Symptoms and the Scale for the Assessment of Negative Symptoms; and (5) although positive and negative syndromes showed factorial validity, they were not sufficient to account for the whole of the schizophrenic symptoms. Unlike Kay's group, we found a modest internal consistency of the positive scale, indicating that it is composed of several independent components. The data suggest that the distinction between positive and negative symptoms is an oversimplification, and that schizophrenic symptoms can be better conceptualized as composed of, at least three dimensional syndromes: positive, disorganized, and negative.

[1]  S. C. Sohlberg,et al.  Social adjustment and cognitive performance of high-risk children. , 1985, Schizophrenia bulletin.

[2]  E. Lindström,et al.  The Swedish version of the Positive and Negative Syndrome Scale (PANSS) for schizophrenia , 1992, Acta psychiatrica Scandinavica.

[3]  H. Meltzer,et al.  DEPARTMENT OF HEALTH AND HUMAN SERVICES , 1992, Disaster Medicine and Public Health Preparedness.

[4]  S. Kay,et al.  The positive and negative syndrome scale (PANSS) for schizophrenia. , 1987, Schizophrenia bulletin.

[5]  D. Cicchetti,et al.  The Positive and Negative Syndrome Scale and the Brief Psychiatric Rating Scale: Reliability, Comparability, and Predictive Validity , 1992, The Journal of nervous and mental disease.

[6]  P. Liddle,et al.  Syndromes of Chronic Schizophrenia , 1990, British Journal of Psychiatry.

[7]  J J Bartko,et al.  ON THE METHODS AND THEORY OF RELIABILITY , 1976, The Journal of nervous and mental disease.

[8]  V. Peralta,et al.  Are There More Than Two Syndromes in Schizophrenia? , 1992, British Journal of Psychiatry.

[9]  M. Krawiecka,et al.  A standardized psychiatric assessment scale for rating chronic psychotic patients , 1977, Acta psychiatrica Scandinavica.

[10]  A. Sommers.  "Negative symptoms": conceptual and methodological problems. , 1985, Schizophrenia bulletin.

[11]  S. Kay,et al.  Significance of Positive and Negative Syndromes in Chronic Schizophrenia , 1986, British Journal of Psychiatry.

[12]  N C Andreasen,et al.  Diagnosis and classification of schizophrenia. , 1993, Schizophrenia bulletin.

[13]  J. Strauss,et al.  The diagnosis and understanding of schizophrenia. Part III. Speculations on the processes that underlie schizophrenic symptoms and signs. , 1974, Schizophrenia bulletin.

[14]  N C Andreasen,et al.  The Distinction of Positive and Negative Symptoms , 1991, British Journal of Psychiatry.

[15]  S. Sevy,et al.  Pyramidical model of schizophrenia. , 1990, Schizophrenia bulletin.

[16]  M. Singh,et al.  The positive-negative distinction in drug-free schizophrenic patients. Stability, response to neuroleptics, and prognostic significance. , 1989, Archives of general psychiatry.

[17]  G. Simpson,et al.  Positive and negative symptoms in schizophrenia: Where are the data? , 1992, Biological Psychiatry.

[18]  S. Kay.  Positive and negative syndromes in schizophrenia: Assessment and research. , 1991 .

[19]  P. Shrout,et al.  Symptom Profiles and Homelessness in Schizophrenia , 1994, The Journal of nervous and mental disease.

[20]  T. Crow,et al.  Molecular pathology of schizophrenia: more than one disease process? , 1980, British medical journal.

[21]  Lewis A. Opler,et al.  Reliability and validity of the positive and negative syndrome scale for schizophrenics , 1988, Psychiatry Research.

[22]  J. Landmark.  A manual for the assessment of schizophrenia. , 1982, Acta psychiatrica Scandinavica. Supplementum.