Gender, age at onset, and duration of being ill as predictors for the long-term course and outcome of schizophrenia: an international multicenter study.

Background: The aim of the current study was to explore the effect of gender, age at onset, and duration on the long-term course of schizophrenia.

Methods: Twenty-nine centers from 25 countries representing all continents participated in the study that included 2358 patients aged 37.21 ± 11.

Modeling psychological function in patients with schizophrenia with the PANSS: an international multi-center study.

Background: The aim of the current study was to explore the changing interrelationships among clinical variables through the stages of schizophrenia in order to assemble a comprehensive and meaningful disease model.

Methods: Twenty-nine centers from 25 countries participated and included 2358 patients aged 37.21 ± 11.

Prevalence and clinical picture of premenstrual syndrome in females from Bulgaria.

Background: Premenstrual syndrome (PMS) and its more severe form premenstrual dysphoric disorder (PMDD) are highly prevalent conditions, but there seems to be ethnic and cultural variances in their distribution.

Aims: To explore the prevalence of PMS/PMDD and their typical clinical features in a Bulgarian population.

Materials And Methods: This investigation was designed and executed as a cross-sectional descriptive study.

Staging of Schizophrenia With the Use of PANSS: An International Multi-Center Study.

Introduction: A specific clinically relevant staging model for schizophrenia has not yet been developed. The aim of the current study was to evaluate the factor structure of the PANSS and develop such a staging method.

Methods: Twenty-nine centers from 25 countries contributed 2358 patients aged 37.