Abstracts
The scope of this paper is to determine the temporal evolution of mortality by suicide in people aged 60 or more per State in Brazil between 1980 and 2009. Historical mortality by suicide data (ICD-9 codes E950 to E959 and ICD-10 codes X60 to X84 and Y87.0) were obtained from the Mortality Information System (SIM / MS). Data regarding population counts were obtained from the Brazilian Institute of Geography and Statistics. In the assessment of temporal trends the Poisson regression model was used, in which the dependent variable was the number of deaths and the centralized calendar year was the explanatory variable. Statistically significant trends were considered those whose p-value was d" 0.05. The results revealed the presence of a statistically significant increasing trend in four states and a decrease in two (general population; 60 years or more). In the male population there was an increase in five states and a reduction in two. The female rate showed an increase in one state and a decrease in three. There was an increasing trend in Piauí, Ceará and Rio Grande do Norte and a reduction in Amazonas, Roraima, and São Paulo for people aged between 60 and 69. Increasing rates were observed in the population aged 70-79 in Piauí and decreasing trends in Roraima.
Suicide; The elderly; Temporal trends; Poisson regression
Este artigo objetiva verificar a evolução temporal da mortalidade por suicídio em pessoas com 60 anos ou mais segundo a unidade da federação no período de 1980 a 2009. Na construção das séries históricas empregaram-se dados da mortalidade por suicídio (CID-9 códigos E950 a E959 e CID-10 códigos X60 a X84 e Y87.0) obtidos do Sistema de Informação sobre Mortalidade (SIM/MS). Dados referentes à contagem populacional foram obtidos do Instituto Brasileiro de Geografia e Estatística. Na avaliação da tendência temporal empregou-se o modelo de regressão de Poisson, no qual a variável resposta foi o número de óbitos e a variável explanatória o ano calendário centralizado. Foram consideradas tendências estatisticamente significativas aquelas cujo p-valor < 0,05. Os resultados mostram a presença de tendência estatisticamente significativa de aumento para quatro estados e de queda para dois (população geral; 60 anos ou mais). Na população masculina houve aumento em cinco e redução em dois. As taxas femininas exibiram aumento em um estado e queda em três. Verificou-se tendência de aumento no Piauí, Ceará e Rio Grande do Norte e de redução no Amazonas, São Paulo e Roraima para aqueles com idades entre 60 e 69 anos. Observaram-se taxas crescentes na população de 70 a 79 anos do Piauí e decrescentes em Roraima.
Suicídio; Idosos; Tendência temporal; Regressão de poisson
ARTIGO ARTICLE
Suicide mortality trends in people aged 60 years or more in the Brazilian states: 1980 to 2009
Evolução temporal da mortalidade por suicídio em pessoas com 60 anos ou mais nos estados brasileiros, 1980 a 2009
Liana Wernersbach PintoI; Thiago de Oliveira PiresII; Cosme Marcelo Furtado Passos da SilvaIII; Simone Gonçalves de AssisII
ICentro Latino-Americano de Estudos de Violência e Saúde Jorge Careli, Escola Nacional de Saúde Pública, Fundação Oswaldo Cruz. Avenida Brasil 4.036/700, Manguinhos. 21040-361 Rio de Janeiro RJ. lianawp@fiocruz.br
IICentro Latino-Americano de Estudos de Violência e Saúde Jorge Careli, Escola Nacional de Saúde Pública, Fundação Oswaldo Cruz. Avenida Brasil 4.036/700, Manguinhos. 21040-361 Rio de Janeiro RJ
IIIDepartamento de Epidemiologia e Métodos Quantitativos, Escola Nacional de Saúde Pública, Fundação Oswaldo Cruz
ABSTRACT
The scope of this paper is to determine the temporal evolution of mortality by suicide in people aged 60 or more per State in Brazil between 1980 and 2009. Historical mortality by suicide data (ICD-9 codes E950 to E959 and ICD-10 codes X60 to X84 and Y87.0) were obtained from the Mortality Information System (SIM / MS). Data regarding population counts were obtained from the Brazilian Institute of Geography and Statistics. In the assessment of temporal trends the Poisson regression model was used, in which the dependent variable was the number of deaths and the centralized calendar year was the explanatory variable. Statistically significant trends were considered those whose p-value was d" 0.05. The results revealed the presence of a statistically significant increasing trend in four states and a decrease in two (general population; 60 years or more). In the male population there was an increase in five states and a reduction in two. The female rate showed an increase in one state and a decrease in three. There was an increasing trend in Piauí, Ceará and Rio Grande do Norte and a reduction in Amazonas, Roraima, and São Paulo for people aged between 60 and 69. Increasing rates were observed in the population aged 70-79 in Piauí and decreasing trends in Roraima.
Key words: Suicide, The elderly, Temporal trends, Poisson regression.
RESUMO
Este artigo objetiva verificar a evolução temporal da mortalidade por suicídio em pessoas com 60 anos ou mais segundo a unidade da federação no período de 1980 a 2009. Na construção das séries históricas empregaram-se dados da mortalidade por suicídio (CID-9 códigos E950 a E959 e CID-10 códigos X60 a X84 e Y87.0) obtidos do Sistema de Informação sobre Mortalidade (SIM/MS). Dados referentes à contagem populacional foram obtidos do Instituto Brasileiro de Geografia e Estatística. Na avaliação da tendência temporal empregou-se o modelo de regressão de Poisson, no qual a variável resposta foi o número de óbitos e a variável explanatória o ano calendário centralizado. Foram consideradas tendências estatisticamente significativas aquelas cujo p-valor < 0,05. Os resultados mostram a presença de tendência estatisticamente significativa de aumento para quatro estados e de queda para dois (população geral; 60 anos ou mais). Na população masculina houve aumento em cinco e redução em dois. As taxas femininas exibiram aumento em um estado e queda em três. Verificou-se tendência de aumento no Piauí, Ceará e Rio Grande do Norte e de redução no Amazonas, São Paulo e Roraima para aqueles com idades entre 60 e 69 anos. Observaram-se taxas crescentes na população de 70 a 79 anos do Piauí e decrescentes em Roraima.
Palavras-chave: Suicídio, Idosos, Tendência temporal, Regressão de Poisson.
Introduction
Suicide is a form of self-inflicted violence in which individuals intentionally take their own lives. Suicidal behavior ranges from ideations about killing oneself to coming up with a plan and obtaining the means to perform the act1. It is today an important public health problem worldwide2.
According to the WHO elderly individuals are the population group with the highest risk of suicide. Despite this fact, the phenomenon still receives little attention from public health authorities, researchers and the media, who usually prioritize younger population groups in their considerations and actions3.
In Brazil approximately 1,200 people who are 60 or older die each year of suicide4. According to the WHO, the worldwide suicide rate in 20005 among men aged 65 or older was 41 deaths for every 100,000 inhabitants. This rate is even higher if one takes into account only those aged 75 or older (50 deaths/100,000 inhabitants)5. Among women rates are usually lower; among women aged 75 or older the global female rate reaches a maximum of 15.8 deaths for each 100,000 inhabitants5. Still according to the WHO suicide rates (not considering the issue of age range) have increased by approximately 60% in the last 45 years5.
The WHO provides data about suicide mortality trends for 104 countries6. Among those 91 have data generated from 2000 onward, that is, they provide information that may be considered recent and updated since this is a phenomenon that usually has a pattern across time. The steadiness with which data about suicide are sent to the WHO varies widely among member countries; only 11 have been providing information on a regular basis since 1950. There is nearly no information about countries in Africa. There is little data about Southeast Asia and the East Mediterranean region. Information about the phenomenon in Latin American countries and parts of the Western Pacific7 is considered irregular.
A study conducted by De Leo et al.8 analyzes suicide mortality in 32 countries and showed a decrease in suicide deaths among male and female populations older than 65 form the 1980's decade onward. According to the author, countries such as Australia, Singapore and United States have shown a decrease in male rates and Australia and Ireland have shown a decrease in female rates. Of all 32 countries included in the study only six showed an increase in male rates when comparing the first and final years within the study period (Ireland, Canada, Sweden, Hong Kong, Japan and South Korea). For women over 65 nine countries showed increased rates (Northern Ireland, Canada, New Zealand, Denmark, Finland, Greece, Hong Kong, Japan and South Korea).
A few national studies show details about suicide among the elderly. When analyzing suicide mortality from 1980 to 2006 in Brazilian regions and capital cities Lovisi et al.2 found that deaths in the age range above 70 were predominant (average of 7.8 deaths in the period analyzed). According to those authors, when the first and final years were compared the age group from 20 to 59 had greater increase (30%) than the group of individuals over 60 (19%). Mello-Santos et al.9 identified that elderly individuals over 65 years old had the highest suicide rates in the period ranging from 1980-2000 in Brazil when compared with other age ranges. A study conducted in Rio Grande do Sul about epidemiological features of suicide showed that the highest coefficients of mortality were found among the elderly; however authors state that rates are also increasing among the young10. A similar study conducted in the State of Santa Catarina showed the presence of increasingly higher coefficients with advancing age for both sexes in studied years11.
This article proposes to analyze suicide mortality trends in individuals aged 60 or older from 1980 to 2009, by Brazilian state.
Methods
This paper presents an analysis of suicide mortality trends of individuals aged 60 or older from 1980 to 2009 by state (UF). Data about completed suicides that form time series were gathered from the Ministry of Health's Mortality Information System (SIM/MS), available from the DATASUS website4. From 1980 to 1995 the 9th Revision of the International Classification of Diseases (ICD) was used - events with codes E950-E959; from 1996 to 2009 ICD's 10th Revision was used - codes X60 to X84 and Y87.0.
When calculating suicide mortality rates we considered as numerator the number of deaths by suicide in a given year and as denominator the estimated population provided by the Brazilian Institute for Geography and Statistics (Fundação Instituto Brasileiro de Geografia e Estatística (IBGE)12 for that particular year. We calculated suicide mortality rates according to sex (male, female) and age range (60-69 years old, 70-79 years old and 80 or older). Rates were standardized by age according to WHO criteria13 using Brazil's 2000 population as standard.
When conducting the initial exploratory analysis of time series using the autocorrelation function (ACF) and the Durbin-Watson test14, we verified the presence of time dependence in series. Data were used as rates to conduct an initial exploratory analysis of time series.
The number of suicide deaths refers to a counting event; therefore we performed trend analysis by Poisson's regression method. We have used as dependent variable the expected values15 for the number of deaths in each UF and as independent variable the centralized year16. We have identified trends in series (stable, increasing or decreasing) by analyzing relative risk obtained based on the coefficient of the regression model (RR = exponential of the coefficient of regression), as well as its 95% confidence interval (CI). We considered as decreasing trend series those whose relative risk values were less than 1, as well as the lower and upper CI limits. To diagnose an increasing trend, coefficient values and CI limits should be greater than 1. We considered as stable series whose lower CI limits were under 1 and whose upper limits were above 1.
This research was approved by the Research Ethics Committee of the National School of Public Health/Oswaldo Cruz Foundation, according to opinion number 119/10.
To perform analyses we used the stats and lmtest libraries of public domain software R 2.12.217.
Results
Figure 1 shows suicide mortality trends in Brazil among the elderly (aged 60 or older) according to sex. One notices that rates for the male population are substantially higher than those for the female population throughout the entire period of analysis. One also notices that male rates were above 10 deaths for every 100,000 inhabitants throughout the entire period of analysis, except for 1981 when they reached a low of 9.8 deaths for every 100,000 inhabitants. Female rates varied significantly throughout the years; overall, however, they ranged from 0 to 8 deaths for every 100,000 inhabitants throughout the entire period. The full line corresponds to the general population and is practically constant throughout 30 years, with rates ranging from 6 to 8 deaths for every 100,000 inhabitants.
Table 1 shows suicide rates among the elderly (aged 60 or older) by state in selected years (1980, 1990, 2000 and 2009) for the general population, male and female.
For states in the North region one observes floating rates ranging from zero to 184.1 deaths for every 100,000 inhabitants. This oscillation suggests issues with suicide reporting data in that region; it could also be caused by the effects of having a small population where a single case may cause the rate to change considerably.
Considering the overall population only, one notices an increase in suicide mortality rates across all states in the Northeast between 1980 and 2009. The same occurred with the male population. In six out of nine northeastern states rates were higher than 10 deaths for every 100,000 inhabitants among the male population in 2009. The highest rate was found in the State of Rio Grande do Norte: 21.5 deaths for every 100,000 inhabitants, among males. Female rates ranged from zero to 4.3 deaths for every 100,000 inhabitants. Among women the highest rate was found in the State of Sergipe in 2009 (4.3).
Rates in the Southeast were low, fluctuating around 5 deaths for every 100,000 inhabitants in studied years. The lowest rate is found in the State of Rio de Janeiro (2.1) in 2009 and the highest is in São Paulo (10.1) in 1980. Rates are higher among the male population, especially in the State of São Paulo where rates remain above 10 deaths for every 100,000 in all four years presented. The rate was also above 10 in 2009 in the State of Minas Gerais (12.1). Once again female rates were much lower than male rates. The highest figure appeared in 1980 in São Paulo (4.1).
For the South region where rates are substantially higher in all states one notices a decrease in suicide rates among the overall population. However, rates are still high; over 14 deaths for every 100,000 inhabitants in the States of Santa Catarina and Rio Grande do Sul. One also observes a decrease in rates among male and female populations. However, rates are still at alarming levels in the States of Rio Grande do Sul (35.6) and Santa Catarina (27.3) among the male population in 2009.
In the Middle West region rates in the State of Mato Grosso do Sul (overall population) are particularly striking, at over 15 deaths for every 100,000 inhabitants in 2009. Among the male population the rate is above 10 deaths for every 100,000 inhabitants across all states; the highest rate is found in 2009 in the state of Mato Grosso do Sul. The highest female rate is also found in this state (7.1).
Brazilian rates for people aged 60 or older are approximately at 7 deaths in every 100,000 inhabitants throughout the entire period. Among the male population the rate remained at approximately 12 deaths for every 100,000 inhabitants in presented years. One notices a decrease in female rates, which fell from 3.0 (1980) to 2.4/100,000 inhabitants (2009).
Poisson's regression model adjustment to data about suicide among the population aged 60 or older, presented in Table 2, has shown there is an increasing trend in the following states: Tocantins, Piauí, Ceará and Bahia. A decreasing trend was found in Roraima and Rio Grande do Sul. Other states had stable rates, without any statistically significant trends.
For the male population we also identified an increasing trend in the states of Tocantins, Piauí, Ceará, Bahia and Pernambuco. Once again in Rio Grande do Sul and Roraima there was a decreasing trend; in the latter this decrease should be regarded with care due to highly unstable rates during that period. There were increasing rates for the female population in the state of Piauí only and decreasing rates for the states of Paraíba, Paraná and Santa Catarina.
Considering the overall Brazilian population and the male sex, rates remained stable throughout the period analyzed, with no statistically significant trends. There was a model convergence issue for the studied female population.
Table 3 shows results from Poisson's regression model adjustment to verify trends in time series of elderly individuals according to state and age range (60-69 years old; 70-79 years old; and 80 or older).
There is a statistically significant increasing trend in the states of Piauí, Ceará and Rio Grande do Norte among the population aged 60 to 69; within that same age range there is a decreasing trend in Amazonas, Roraima and São Paulo. Among the population aged 70 to 79 it was possible to identify an increasing trend in rates in the state of Piauí. Among individuals aged 80 or older we identified a decreasing trend in rates in Roraima.
Discussion
Results show that overall Brazilian suicide rates among the elderly have been stable throughout 30 years of analysis at 7 for each 100,000 for both sexes and 12 for each 100,000 inhabitants among men in that age range. Such results place Brazil on an average level of suicide episodes worldwide, according to the WHO (between 5-15 deaths for each 100,000 inhabitants). Among women rates have remained low (less than 5 for each 100,000 inhabitants)18.
The decreasing trend stands out in a few states where rates have been historically the highest in the country (states in the South region, especially Rio Grande do Sul). However, despite the significant decreasing trend rates are still very high, which requires further studies to expand knowledge about this issue and to foster action being taken by authorities. The state of Mato Grosso do Sul also has high rates throughout the entire period of analysis. In the abovementioned states a possible explanation is the influence of pesticides used in farming and the significant numbers of individuals from European and Indigenous descent10,19,20.
Santa Catarina, Rio Grande do Sul and Mato Grosso do Sul stand out for showing high rates in some years of the series (between 15 and 30 for each 100,000 inhabitants), according to WHO criteria. For male elderly individuals the rates in the latter two states in some of the years are considered very high (above 30 for each 100,000)18.
Evidence of higher rates among male elderly individuals throughout the entire period confirms the results of national and international studies. Such differences may be related to the fact that women use less lethal means in their suicide attempts and seek more help in the social environment where they live, according to several authors2,21-24.
In this study, which used standardized rates, we have not found higher rates among older elderly individuals, as other authors have9,24,25. A Brazilian study that used non-standardized rates found higher coefficients among elderly individuals older than 70 when compared with the group aged 60-69, from 1980 to 20062; among elderly individuals aged 60 to 69 there was a higher increase in rates, 27% (comparing the first triennium, 1980-1982, with the last, 2004-2006), than among individuals aged 70 and older (12.5%). However, according to this study the latter group had higher rates throughout the entire studied period.
With respect to trends between 1980 and 2009, our study used Poisson's regression model (with standardized rates) and found a significant increasing trend in four states and decreasing trend in two states. Among the male population there was an increasing trend in five and decreasing trend in two states. Female rates increased in one state and decreased in three. Considering the subdivision into age ranges (60-69, 70-79 and 80 or older), we have verified an increasing trend in Piauí, Ceará and Rio Grande do Norte and a decreasing trend in Amazonas, São Paulo and Roraima. We have observed increasing trends among the population aged 70 to 79 in Piauí and decreasing trends in Roraima.
Those results differ from the ones found by Brzozowski et al.25, who studied the period ranging from 1980 to 2005 and found an increase in male rates (aged 60 or older) across 14 states and a decrease in two states; female rates (aged 60 or older) decreased in seven states and increased in four, by using Prais-Winsten generalized linear regression models to verify the trend. Differences in results may arise from using different models for analysis (Poisson's Regression and Linear Regression) and/or from result standardization performed by the authors of this study.
Results should be interpreted with care. Data provided by some states should be analyzed carefully, since a sharp increase or decrease in rates suggests there are problems with case reporting, or it could be a consequence of a small elderly population - in this case a single death can result in high rates.
Another aspect worthy of attention is that detailed analysis results by age range (60-69, 70-79 and 80 or older) were compromised by excessive zeros across the time series. This was especially the case with the age range of individuals aged 80 or older and in such cases the chosen Poisson model did not converge. Additionally, deaths by suicide are known to be underreported26, despite the declining percentage of deaths from unclear causes in the country in the last two decades, from 20% to 13%275. This precariousness may hide the real situation of suicide statistics throughout different states and municipalities in Brazil28.
Final Considerations
This paper is part of a study about elderly suicide in Brazil where magnitude and meanings were crossed in an attempt to understand the problem and possibilities for action toward prevention. Several perspectives related both to promoting quality of live and specific attention and care are described in the other articles published in this edition. This research was conducted using standardized rates; therefore it presents different results in Brazil than those cited in national and international literature, which show higher suicide rates among the population older than 75. In any case, there is evidence that suicide among elderly males is relevant across the country, especially in states in the South and Middle West.
The fact that statistics show decreasing rates in southern States, especially Santa Catarina and Rio Grande do Sul although they are still the highest in the country shows that it is possible to take preventive action to decrease self-inflicted deaths. Such action is being taken in several municipalities in the last few years.
The healthcare and social sectors have a crucial role providing support and protection to elderly individuals, above all to encourage them to feel useful, active and socially integrated. Those who start losing physical, psychological and economic autonomy require more care and therefore their lives tend to lose some meaning. The WHO29 and the Ministry of Health30 provide guidelines that help professionals who work in this field, especially those in Mental Health, to take effective preventive action and to promote life.
Collaborations
LW Pinto, TO Pires, CMFP Silva and SG Assis participated equally in all stages of preparation of the article.
References
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29Organização Mundial da Saúde (OMS). Prevenção do Suicídio: um manual para profissionais da saúde em atenção primária. Genebra: OMS, 2000.
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30Brasil. Ministério da Saúde (MS). Portaria n.1.876, de 14 de agosto de 2006. Define diretrizes nacionais de prevenção ao suicídio. Diário Oficial da União 2006; 15 ago.
Evolução temporal da mortalidade por suicídio em pessoas com 60 anos ou mais nos estados brasileiros, 1980 a 2009
Publication Dates
-
Publication in this collection
30 Jan 2013 -
Date of issue
Aug 2012
History
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Received
21 Mar 2012 -
Accepted
10 May 2012