What is the Best Latent Structure of Negative Symptoms in Schizophrenia? A Systematic Review.

Background: Determining the best latent structure of negative symptoms in schizophrenia could benefit assessment tools, neurobiological research, and targeted interventions. However, no review systematically evaluated studies that assessed and validated latent models of negative symptoms.

Objective: To identify and evaluate existing latent structure models in the literature of negative symptoms and to determine the best model.

Longitudinal invariance of the positive and negative syndrome scale negative dimension in antipsychotic naïve first-episode schizophrenia.

Aim: Construct stability over time is required for reliable inference, but evidence regarding the longitudinal invariance of negative symptoms is still limited. Thus, we examined the longitudinal invariance of the negative dimension using the positive and negative syndrome scale (PANSS) in an antipsychotic-naïve first-episode schizophrenia sample at baseline and after 10 weeks.

Methods: Our study was conducted at a specialized early intervention service.

Evaluation of Ongoing Participation of People with Schizophrenia in a Mutual Support Group as a Complementary Intervention to Outpatient Psychiatric Treatment.

This study aims to evaluate a group of people with schizophrenia undergoing outpatient treatment and who participate in a mutual support intervention, compared to another group of people with the same diagnosis, but attending only the usual outpatient treatment. This is a prospective study, with two measurements between six months. The mutual support group was initially composed of 16 people and the treatment as usual group was composed of 15 people.