Volume 5 - 2000
Editor: Giovanni Torello
Dezembro de 2000 - Vol.5 - Nº 12
No Paiz dos Yankees
Epidemiology of Schizophrenia in a semi-rural area in Northeast Brazil
Nessas últimas semanas não tivemos Grand Rounds porque o departamento como um todo esta concentrado em aulas para os estudantes de medicina. Decidi então utilizar um artigo meu, acerca de epidemiologia da esquizofrenia no Nordeste do Brazil, publicado no comeco desse ano no Journal of Nervous and Mental Diseases, como minha coluna de dezembro. Desejo a todos boas festa. Até o próximo mês.
PS o artigo está em inglês porque não tive tempo de traduzir, se alguem tiver alguma dúvida, manda para [email protected]
Epidemiology of Schizophrenia in a semi-rural area in Northeast Brazil
Erick Messias, M.D.
1Maryland Psychiatric Research Center
- Department of Psychiatry - University of Maryland Baltimore, Maryland
For submission to:
Address correspondence to:Erick Messias, MD
The systematic study of the epidemiology of schizophrenia in tropical countries data back to at least 1904, when Kraepelin traveled to Java and interviewed 100 psychiatric patients, 39 of whom he diagnosed as exhibiting dementia praecox (Bendick, 1989). Understanding the distribution and presentation of schizophrenia in different cultures was also the goal of two international studies, the International Pilot Study of Schizophrenia (IPSS) and the Determinants of Outcome of Severe Mental Disorders (Sartorious et al. 1977, 1986). The IPSS found important similarities in the distribution and presentation of schizophrenia across cultures, but also showed differences regarding outcome, in particular a more favorable course in developing countries (Sartorious, 1986).
The epidemiology of schizophrenia in tropical regions has received relativley little study, and Brazil is no exception. In Brazil, the more developed south has been studied more than the poorer (Menezes, 1993, Menezes, 1996, Kerr-Correa, 1998; Santos, 1998), and urban areas have more studied more than rural ones (Sousa e Silva, 1998; Almeida-Filho & al., 1997, Araujo & Monteiro, 1995). Even the best designed epidemiological study to date concentrated on three large urban settings, none of them in the Northeast (Almeida-Filho, 1997). In the present study, we examined the epidemiology of schizophrenia in a rural region in northeastern Brazil.
Our study was performed in Sao Camilo de Lelis Hospital in Mossoro, a city in the state of Rio Grande do Norte in the northeastern Brazilian hinterland (5 degrees 11 minutes south, 37 degrees 21 minutes west). In the 1990 census, Mossoro had 192,267 inhabitants, but Sao Camilo de Lelis Hospital serves a population of approximately a quarter million inhabitants, and is the only inpatient or outpatient psychiatric facility in this area. The hospital was opened in 1964; prior to that time, the region had no inpatient or outpatient psychiatric facility.
Information was obtained from the clinical records of the hospital, including date of birth, date of first admission, gender, marital status and clinical subtype for all patients admitted with a diagnosis of schizophrenia. Patients admitted from 1964, when the hospital opened to 1994 were included in the study. The diagnosis was made at the time of admission by the house staff and, in most of cases, an ICD subtype diagnosis was also recorded. The diagnostic criteria used were based on the International Classification of Diseases (ICD), which included paranoid, hebephrenic, residual, simple and catatonic subtypes. Psychiatry in Brazil has been heavily influenced by French and German psychiatry (Knobel, 1984), leading to the use of the ICD in the clinical setting. Ethnicity was not recorded.
There were 2856 patients admitted with a diagnosis of schizopihrenia. Of these, 55% were male and 45% female. The mean age at admission was 31.2 (+ 11.59). Males had an earlier age of onset (t=5.57; d.f. with unequal variance = 2296; P<.001), and a smaller percentage of males had been married prior to admission (chi-square = 62.0; d.f = 1; p < .0001; Table 1). In a logistic regression analysis both age (chi-square = 62.8; d.f.=1; p < .0001) and gender (chi-square = 48.5; d.f. = 1; p < .0001) were signficant predictors of marital status (as a 0/1 variable) at the time of admission.
The paranoid and simple subtypes were the most common (Table 2). The males and females did not differ relative to subtype (chi-square = 6.06; d.f = 8; p =.64).
In this sample from northeastern Brazil, we found males had an earlier age of onset, and had poorer premorbid function as measured by marriage prior to admission. The difference in marriage did not appear to be due to the younger age of the males, as the difference was still significant after accounting for the variance in marriage associated with age.
Limitations of the study should be considered when analyzing the results. First, these were clinical diagnoses given by psychiatrists in their everyday practice. The interrater reliability of these diagnoses is not known. Second, these patients constituted a hospitalized sample. As no outpatient facilities were availalbe during the time of these admission, the bias due to inpatient versus outpatient treatment should have been small. However, the size of any bias due to treatment versus no treatment is not known. Finally, although the data came from the patients’ first hospitalizations, some may have had previous episodes of illness which did not lead to treatment.
Other studies internationally have had findings similar to ours, relative to gender ratio, age of onset, and social function. However, the percentage of patients with the simple subtype is unusual. This subtype was considered for inclusion in the DSM IV (McGlashan & Fenton, 1991), where it is listed in an appendix for further study because of insufficient information. However, the simple subtype is included in the ICD 10 (CID 10, 1993), which is the system used in Brazil. The other study on hospital treated schizophrenia in South Brazil does not mention ICD subtype. (Menezes, 1993)
Despite the limitations of our data, the similarities to results from other countries is reassuring, and may permit health officials in northeastern Brazil to make plans on the basis population estimates that are likely to be rather similar to those in other countries and other regions of Brazil. (Menezes, 1993, Menezes, 1996, Kerr-Correa, 1998; Santos, 1998)
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Schizophrenia Subtypes in Sao Camilo de Lelis Hospital in Mossoro, Rio Grande do Norte, Brazil
Demographic Features of Patients in Sao Camilo de Lelis Hospital in Mossoro