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OBJECTIVE The lack of fit of 25 previously published five-factor models for the PANSS items, can be due to the statistics used. The purpose of this study was to use a 'new' statistical method to develop and confirm an improved five-factor model. The improved model is both complex and stable. Complex means that symptoms can have multiple factor loadings,(More)
IMPORTANCE The efficacy of posttraumatic stress disorder (PTSD) treatments in psychosis has not been examined in a randomized clinical trial to our knowledge. Psychosis is an exclusion criterion in most PTSD trials. OBJECTIVE To examine the efficacy and safety of prolonged exposure (PE) therapy and eye movement desensitization and reprocessing (EMDR)(More)
OBJECTIVE The aim of this study was to test the goodness-of-fit of all previously published five-factor models of the Positive and Negative Syndrome Scale (PANSS). METHODS We used confirmatory factor analysis (CFA) with a large data set (N = 5769). RESULTS The different subsamples were tested for heterogeneity and were found to be homogeneous. This(More)
The aim of this guidance paper of the European Psychiatric Association is to provide evidence-based recommendations on the early detection of a clinical high risk (CHR) for psychosis in patients with mental problems. To this aim, we conducted a meta-analysis of studies reporting on conversion rates to psychosis in non-overlapping samples meeting any at(More)
OBJECTIVE To investigate the effect of a (minimally) guided peer support group (GPSG) for people with psychosis on social network, social support, self-efficacy, self-esteem, and quality of life, and to evaluate the intervention and its economic consequences. METHOD In a multi-center randomized controlled trial with 56 patients in the peer support group(More)
In this article we describe the findings of an exploratory study into the application of early recognition and early intervention methods aimed at prevention of psychotic relapses in patients with schizophrenia. Following the results we described in part 1, we now focus specifically on factors which favourably or adversely affect the use of early(More)
A randomized, controlled trial of a 3-month cognitive remediation program was examined for its efficacy at ameliorating deficits in social and emotion perception in 42 hospitalized patients with schizophrenia. Generalization of training effects to attention, memory, and executive functioning was also examined. The program included an eclectic mix of(More)
This selective review combines cognitive models and biological models of psychosis into a tentative integrated neuropsychiatric model. The aim of the model is to understand better, how pharmacotherapy and cognitive-behavior therapy come forward as partners in the treatment of psychosis and play complementary and mutually reinforcing roles. The article(More)
OBJECTIVE Better recruitment strategies are needed to improve the identification of people at ultra-high risk of developing psychosis. This study explores the effectiveness of two recruitment strategies: a screening method in a consecutive help-seeking population entering secondary mental health services for non-psychotic problems vs. a population referred(More)
BACKGROUND There is increasing evidence that cognitive-behavioural therapy can be an effective intervention for patients experiencing drug-refractory positive symptoms of schizophrenia. AIMS To investigate the effects of cognitive-behavioural therapy on in-patients with treatment-refractory psychotic symptoms. METHOD Manualised therapy was compared with(More)