Symptom dimensions stability over time in recent onset psychosis: A prospective study

Area of Science:

• Psychiatry
• Psychology
• Factor Analysis

Background:

• The factorial structure and temporal dynamics of schizophrenia symptoms are debated.
• Symptom differentiation and dedifferentiation describe changes in symptom correlations over time.
• Little is known about these dynamics in recent onset psychosis.

Purpose of the Study:

• To investigate symptom differentiation or dedifferentiation over time in recent onset psychosis.
• To analyze the dynamic changes in symptom correlations using the Positive and Negative Syndrome Scale.

Main Methods:

• Confirmatory factor analysis of the Positive and Negative Syndrome Scale (PANSS) five-factor model.
• Data collected at seven time points over a three-year period from 362 patients.
• Inclusion of a general factor to capture common variance and calculation of explained variance for general and specific factors.

Main Results:

• No evidence of symptom differentiation or dedifferentiation was found over the three-year study period.
• Specific symptoms accounted for over 70% of the variance, indicating high symptom specificity.
• The findings support the distinctness of individual symptoms in recent onset psychosis.

Conclusions:

• The study supports a multidimensional approach to clinical symptom assessment in psychosis.
• The findings challenge inherently one-dimensional staging approaches to psychosis.
• Further research is needed to explore the implications for clinical assessment and treatment.