Neighborhood differences in psychoses: prevalence of psychotic disorders in two socially-differentiated metropolitan areas of Barcelona.

INTRODUCTION: The prevalence of schizophrenia and other psychoses can vary between close geographic locations and can be biased by the use of epidemiological designs. With data derived from a public mental health centre with close relations to primary care teams we have compared the distribution of psychotic disorders in two neighborhoods in Barcelona with marked psycho-social differences. METHODS: Using a computerized database from Barcelona's National Health Service covering 5 basic health-care areas with a total population of 103,615 inhabitants, we have accessed case records showing any psycho-pathology between the years of 1982 and 2000. RESULTS: From the case records of 21,536 registered patients showing any psycho-pathology, and using strict diagnostic, clinical and assistance criteria, we found that there were 476 patients diagnosed as "schizophrenic" and 362 that were "affected by other psychoses." Despite being evaluated by the same mental health personal, the same research team using identical criteria and over the same period of time (thus precluding operator and selection bias) the prevalence of these disorders was twice as high in La Mina (a district with a marked accumulation of psycho-social risk-factors) as compared to the neighboring district of La Verneda. CONCLUSIONS: When assessing prevalence of psychoses, it is necessary to consider the impact of social and psycho-social factors, even in neighboring communities.

[Schizophrenic disorders in primary care mental health]. / Trastornos esquizofrénicos en la atención primaria a la salud mental.

OBJECTIVES: To determine the prevalence and incidence of schizophrenia and other psychoses in a mental health unit (MHU) closely connected to primary health care. DESIGN: Retrospective longitudinal study of the register of all patients with psychiatric illnesses detected in a specific geo-demographic and health care area. SETTING: Five basic health care areas of Barcelona (103 615 inhabitants). PARTICIPANTS: MHU patients who had attended clinics due to mental health disorders during the period from 1982-2000 (N=21 236). Strict health and diagnostic criteria based on the DSM-4 classification were applied. All cases were validated using clinical history review and concensus. MEASUREMENTS: Incidence (in the last 3 years) and prevalence of schizophrenia and other psychoses in the whole period of study, both in the general population and in the risk population age group (15-54 years). RESULTS: In total, 838 patients complied with the diagnosis of suffering from schizophrenia (N=476) or other psychoses (N=362). The incidence of schizophrenia was 3.47/10,000 (95% confidence interval [CI], 2.3-4.6) in the general population and 5.09/10,000, 95% CI, 3.2-6.9) in the population at risk, and the prevalence of schizophrenia was 54.9/10,000 (95% CI, 41.8-50.1) in the general population and 80.7/10,000 (95% CI, 73.5-88) in the population at risk. CONCLUSIONS: The MHU-primary health care interface can be a good place to detect and study schizophrenic syndromes and other psychoses, as long as they comply with the agreed health and research criteria.