psychiatrist

This work may not be copied, distributed, displayed, published, reproduced, transmitted, modified, posted, sold, licensed, or used for commercial purposes. By downloading this file, you are agreeing to the publisher’s Terms & Conditions.

Article

Predominance of Symptoms Over Time in Early-Onset Psychosis: A Principal Component Factor Analysis of the Positive and Negative Syndrome Scale

Marta Rapado-Castro, PhD; Cesar Soutullo, MD, PhD; David Fraguas, MD; Celso Arango, MD, PhD; Beatriz Payá, MD; Josefina Castro-Fornieles, MD, PhD; Ana González-Pinto, MD, PhD; Mara Parellada, MD, PhD; Montserrat Graell, MD; Inmaculada Baeza, MD, PhD; and Igor Bombin, PhD

Published: March 15, 2010

Article Abstract

Background: Early-onset psychosis is a symptomatically nonspecific and heterogeneous entity composed of several diagnoses. This study examined the dimensional structure of symptoms and the temporal stability of this structure during a 6-month follow-up.

Method: A principal component factor analysis of the Positive and Negative Syndrome Scale was conducted at baseline, 4 weeks, and 6 months in a sample of 99 first-episode psychotic patients (mean age = 15.5 years).

Results: The factor analysis produced a 5-dimension solution (Positive, Negative, Depression, Cognitive, Hostility) that explained 62.4% of the variance at baseline, 63.4% at 4 weeks, and 65.1% at 6 months. Negative dimension was the most consistent and stable over time and was predominant at baseline (23.9%) and at 4 weeks (25.7%). Depression was predominant at 6 months (31.1%).

Conclusions: There is a stable 5-dimension structure of symptoms in early-onset psychosis with varying predominance of symptoms over time. Negative symptoms are a core feature of psychosis and are thus important diagnostic criteria.

J Clin Psychiatry 2010;71(3):327-337

Submitted: November 4, 2008; accepted June 3, 2009.

Corresponding author: Marta Rapado-Castro, PhD, Adolescent Unit, Department of Psychiatry, Hospital General Universitario Gregorio Marañón, C/ Ibiza 43, 28009 Madrid, Spain (mrapado@hggm.es).

Volume: 71

Quick Links:

Continue Reading…

Subscribe to read the entire article

$40.00

Buy this Article as a PDF

References