Functioning, symptom expression and risk along the psychosis continuum.

Area of Science:

• Psychiatry and Mental Health
• Epidemiology
• Psychosis Research

Background:

• The psychosis continuum model suggests subclinical psychotic experiences (PEs) can be distinguished from clinical disorders by the absence of a 'need for care'.
• Understanding the spectrum of psychosis is crucial for accurate diagnosis and intervention.

Purpose of the Study:

• To examine variations in functioning, symptomology, and etiological risk across the psychosis phenotype, from no PEs to diagnosed psychotic disorders.
• To investigate how risk factors and symptom expression differ across distinct levels of the psychosis continuum.

Main Methods:

• Utilized data from Wave 2 of the National Epidemiologic Survey on Alcohol and Related Conditions (NESARC) with 34,653 participants.
• Categorized participants into four groups: No PEs, PE-Experienced Only, PE-Impaired, and Diagnosed psychotic disorder.
• Analyzed differences in functioning, symptom endorsement, and etiological risk factors among these groups.

Main Results:

• A graded trend was observed, with the Diagnosed group exhibiting the poorest functioning, followed by PE-Impaired, then PE-Experienced Only, compared to No PEs.
• The PE-Impaired group reported endorsing more PEs than the PE-Experienced Only and Diagnosed groups.
• Trauma, current mental health diagnoses (anxiety, depression), and drug use differentiated all continuum levels except the extreme end (PE-Impaired vs. Diagnosed).

Conclusions:

• Findings support continuum-based interpretations of the psychosis phenotype, emphasizing the importance of considering gradual changes in impairment, symptom expression, and risk.
• Highlights opportunities to refine understanding of how these factors evolve across the psychosis spectrum.
• Suggests that interventions may need to be tailored to different points along the psychosis continuum.