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Related Experiment Videos

Symptom structure in schizophrenia: two-, three- or four-factor models?

S Dollfus1, B Everitt

  • 1Centre Hospitalier et Universitaire, Groupe de Recherche UPRES, Caen, France.

Psychopathology
|June 24, 1998
PubMed
Summary
This summary is machine-generated.

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This study found that the Scale for the Assessment of Negative Symptoms (SANS) and Scale for the Assessment of Positive Symptoms (SAPS) effectively identified distinct symptom dimensions in schizophrenia, unlike the Positive and Negative Syndrome Scale (PANSS).

Area of Science:

  • Psychiatry
  • Clinical Psychology
  • Neuroscience

Background:

  • Schizophrenia symptoms are traditionally categorized into negative and positive dimensions.
  • However, other symptomatic dimensions beyond this dichotomy have been suggested.
  • Identifying robust symptom structures is crucial for characterizing schizophrenia.

Purpose of the Study:

  • To investigate which symptom structures can be individualized to characterize schizophrenia.
  • To compare the utility of SANS-SAPS and PANSS in identifying these structures.

Main Methods:

  • Confirmatory factor analysis was employed.
  • The study included 135 patients diagnosed with schizophrenia.
  • Symptom data were collected using the Scale for the Assessment of Negative Symptoms (SANS) and Scale for the Assessment of Positive Symptoms (SAPS), and the Positive and Negative Syndrome Scale (PANSS).

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Main Results:

  • A two-factor model (negative-positive), a three-factor model (negative-positive-disorganization), and a four-factor model (negative-positive-disorganization-relational) were identified using SANS-SAPS.
  • No adequate models were identified using PANSS.
  • These findings confirm the relevance of dimensions beyond the negative-positive dichotomy.

Conclusions:

  • The SANS-SAPS is more effective than PANSS in identifying a dimensional factor structure of schizophrenic symptoms.
  • The study supports the inclusion of disorganization and relational dimensions in schizophrenia symptom assessment.
  • Further research may refine these symptom structures for better characterization and treatment of schizophrenia.