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Cardiovascular Disease Mortality According to the Brazilian Information System on Mortality and the Global Burden of Disease Study Estimates in Brazil, 2000-2017

Abstract

Background

The Brazilian Information System on Mortality (SIM) is of vital importance in monitoring the trends of cardiovascular diseases (CVDs) and is aimed at supporting public policies.

Objective

To compare historical series of CVD mortality based on data from the SIM, with and without correction, and from the Brazil Global Burden of Disease (GBD) Study 2017, in the 2000-2017 period.

Methods

Analysis of CVD mortality in Brazil between 2000 and 2017. Three CVD mortality estimates were compared: Crude SIM, Corrected SIM, and GBD 2017. Absolute numbers and age-standardized rates were used to compare the estimates for Brazil, its states and the Federal District.

Results

In the SIM, the total of deaths ranged from 261,000, in 2000, to 359,000, in 2017. In the GBD 2017, the total of deaths ranged from 292,000 to 388,000, for the same years, respectively. A high proportion of the causes of death from CVD corresponded to garbage codes, classified according to the GBD 2017, reaching 42% in 2017. The rates estimated by GBD ranged from 248.8 (1990) to 178.0 (2017) deaths per 100,000 inhabitants. The rates of the Crude SIM and Corrected SIM also showed a reduction for the whole series analyzed, the Crude SIM showing lower rates: 204.9 (1990) and 155.1 (2017) deaths per 100 thousand inhabitants. When analyzing by the states and Federal District, the Crude SIM trends reversed, with an increase in mortality rates in the Northern and Northeastern states.

Conclusion

This study shows the decrease in CVD mortality rates in Brazil in the period analyzed. Conversely, when analyzing by the states and Federal District, the Crude SIM showed an increase in those rates for the Northern and Northeastern states. The use of crude data from the SIM can result in interpretation errors, indicating an increase in rates, due to the increase in death data capture and the improvement in the definition of the underlying causes of death in the past decade, especially in the Northern and Northeastern regions, justifying the use of corrected data in mortality analyses. (Arq Bras Cardiol. 2020; 115(2):152-160)

Cardiovascular Diseases/mortality; Data Accuracy/trends; Health Information System/trends; Epidemiology

Resumo

Fundamentos

O Sistema de Informação sobre Mortalidade (SIM) é de vital importância no monitoramento das tendências das doenças cardiovasculares (DCV), tendo por objetivo apoiar as políticas públicas.

Objetivo

Comparar séries históricas de mortalidade por DCV tendo como fonte de dados o SIM com e sem correção e o estudo Carga Global de Doenças (GBD) 2017 no Brasil no período de 2000 a 2017.

Métodos

Análise da mortalidade por DCV no Brasil entre 2000 e 2017 por meio de comparações de três estimativas de mortalidade por DCV: SIM Bruto, SIM Corrigido e GBD 2017. Foram utilizados os números absolutos e as taxas padronizadas por idade para comparação das estimativas para o Brasil e as unidades da federação.

Resultados

No SIM, o total de óbitos por DCV variou de 261 mil, em 2000, a 359 mil, em 2017, e no GBD 2017, de 292 mil a 388 mil nos mesmos anos, respectivamente. Observou-se alta proporção de códigos garbage definidos pelo GBD 2017 nas causas de morte por DCV, chegando a 42% em 2017. As taxas de óbitos por 100 mil habitantes estimadas pelo GBD variaram de 248,8 (1990) a 178,0 (2017). As taxas do SIM Bruto e do SIM Corrigido também mostraram redução para toda a série analisada, sendo que o SIM Bruto apresentou taxas mais baixas, de 204,9 (1990) e 155,1 (2017) óbitos por 100 mil habitantes. Ao analisar por unidade da federação, as tendências do SIM Bruto se invertem, com aumento das taxas de mortalidade nos estados das regiões Norte e Nordeste.

Conclusão

O estudo aponta a diminuição das taxas de mortalidade por DCV no período analisado para o Brasil. Ao contrário, na análise por unidade da federação, a variação porcentual do SIM Bruto foi de aumento para os estados do Norte e Nordeste. O uso dos dados não ajustados do SIM pode resultar em erros na interpretação, indicando aumento das taxas decorrente do aumento na captação de óbitos e da melhoria na definição das causas básicas de morte na última década, em especial nas regiões Norte e Nordeste, o que justifica sempre utilizar dados corrigidos na análise de mortalidade. (Arq Bras Cardiol. 2020; 115(2):152-160)

Doenças Cardiovasculares/mortalidade; Sistema de Informação em Saúde/tendências; Confiabilidade dos Dados/tendências; Epidemiologia

Introduction

In past years, Brazil has compiled different data sources that constitute the information system on morbidity and mortality and periodic health inquiries, which enable the continuous monitoring of data on mortality, morbidity, and risk factors for cardiovascular diseases (CVDs), and support decision-making processes in health policies.11. Brasil. Ministério da Saúde. Departamento de Informática do SUS – DATASUS. Informações de Saúde, Epidemiológicas e Morbidade: banco de dados. [Acesso em 12 fev 2018]. Disponível em: http://www2.datasus.gov.br/DATASUS/index.php?area=0501.
http://www2.datasus.gov.br/DATASUS/index...
, 22. Brasil. Ministério da Saúde. Saúde Brasil 2018 uma análise de situação de saúde e das doenças e agravos crônicos: desafios e perspectivas. Brasília ;2019.

The Brazilian Information System on Mortality (SIM), which provides data to identify and address death record information, was implanted in 1975, being the first nationwide epidemiological database of the Brazilian Health Ministry.33. Mello Jorge MHP, Laurenti R, Gotlieb SL. Análise da qualidade das estatísticas vitais brasileiras: a experiência de implantação do SIM e do SINASC. Ciênc Saúde Coletiva. 2007;12(3):643-54. The cornerstone of SIM is the death certificate, which should be completed by the physician caring for the deceased patient. In the absence of that professional, however, the death certificate can be completed by: the substitute physician; the physician from the Death Verification Service – for natural causes of death; or the coroner – for deaths by external causes.22. Brasil. Ministério da Saúde. Saúde Brasil 2018 uma análise de situação de saúde e das doenças e agravos crônicos: desafios e perspectivas. Brasília ;2019. , 33. Mello Jorge MHP, Laurenti R, Gotlieb SL. Análise da qualidade das estatísticas vitais brasileiras: a experiência de implantação do SIM e do SINASC. Ciênc Saúde Coletiva. 2007;12(3):643-54.

All Brazilian municipalities must register their deaths, which results in around 1.3 million deaths reported per year, making SIM one of the major tools to monitor the mortality statistics in Brazil. The SIM coverage has increased in all Brazilian states and Federal District, passing from 86% in 2000 to 98% in 2017; however, some Northern and Northeastern states maintain coverages lower than 95%.11. Brasil. Ministério da Saúde. Departamento de Informática do SUS – DATASUS. Informações de Saúde, Epidemiológicas e Morbidade: banco de dados. [Acesso em 12 fev 2018]. Disponível em: http://www2.datasus.gov.br/DATASUS/index.php?area=0501.
http://www2.datasus.gov.br/DATASUS/index...

2. Brasil. Ministério da Saúde. Saúde Brasil 2018 uma análise de situação de saúde e das doenças e agravos crônicos: desafios e perspectivas. Brasília ;2019.
- 33. Mello Jorge MHP, Laurenti R, Gotlieb SL. Análise da qualidade das estatísticas vitais brasileiras: a experiência de implantação do SIM e do SINASC. Ciênc Saúde Coletiva. 2007;12(3):643-54. In addition, the number of ill-defined causes of death in Brazil has decreased, although it still remains high in some states. Therefore, the analyses of health status based on mortality records should be carried out with corrective methodologies that can minimize the bias caused by ill-defined causes of death, garbage codes (GC), and death underreporting.44. Saltarelli RMF, Prado RR, Monteiro RA, Malta DC. Tendência da mortalidade por causas evitáveis na infância: contribuições para a avaliação de desempenho dos serviços públicos de saúde da Região Sudeste do Brasil. Rev Bras. Epidemiol.2019;22:e190020.

5. Marinho FM, Passos V. Malta DC, Barbosa FE, Abreu DMX. Burden of disease in Brazil, 1990-2016: a systematic subnational analysis for the Global Burden of Disease Study 2016. Lancet. 2018 Sep 1;392(10149):760-75.
- 66. Ishitani LH, Teixeira RA, Abreu DMX, Paixão LMMM, França EB. Qualidade da informação das estatísticas de mortalidade: códigos garbage declarados como causas de morte em Belo Horizonte, 2011-2013. Rev Bras. Epidemiol. 2017;20(Suppl 1):34-45. 20(Suppl 1):34-45.

Since 1990, the Global Burden of Disease (GBD) Study has adopted a methodology that consists in large advances and in a paradigm change in the epidemiological analysis of secondary data, by proposing an integrated focus on diseases and deaths, with robust and standardized methodology of analysis that contemplates the correction of GC, ill-defined causes of death, and death underreporting.77. Murray CJ, Ezzati M, Flaxman AD, Lim S, Lozano R, Michaud C, et al. GBD 2010: design, definitions, and metrics. Lancet. 2012;380(9859):2063-6. The GBD Study provides comprehensive information on 249 causes of death in 195 locations, contemplating countries and some subnational levels, such as Brazil and its 26 states and Federal District. In the GBD Study, the information on causes of death has been collected from vital record systems, mortality surveillance systems, research, hospital records, police records, and verbal autopsies. For Brazil and its 26 states and Federal District, the SIM is the data source on mortality.77. Murray CJ, Ezzati M, Flaxman AD, Lim S, Lozano R, Michaud C, et al. GBD 2010: design, definitions, and metrics. Lancet. 2012;380(9859):2063-6. , 88. Naghavi M, Abajobir AA, Abbafati C, Abbas KM, Abd-Allah F, Abera SF, et al. Global, regional, and national age-sex specific mortality for 264 causes of death, 1980–2016: a systematic analysis for the Global Burden of Disease Study 2016. Lancet.2017;390(10100):1151-210. In the GBD Study, several statistical models are used to best estimate the number of deaths per each cause of death according to sex and age. The GBD Study enables comparisons between countries, regions, and subnational data, because the quality of the local mortality data is standardized. In addition, the GBD Study enables the analysis of population trends, because the temporal series data are corrected and standardized, making comparison over time possible.77. Murray CJ, Ezzati M, Flaxman AD, Lim S, Lozano R, Michaud C, et al. GBD 2010: design, definitions, and metrics. Lancet. 2012;380(9859):2063-6.

8. Naghavi M, Abajobir AA, Abbafati C, Abbas KM, Abd-Allah F, Abera SF, et al. Global, regional, and national age-sex specific mortality for 264 causes of death, 1980–2016: a systematic analysis for the Global Burden of Disease Study 2016. Lancet.2017;390(10100):1151-210.

9. Foreman KJ, Naghavi M, Ezzati M. Improving the usefulness of us mortality data: New methods for reclassification of underlying cause of death. Popul Health Metr. 2016;14:14.
- 1010. Global Burden Diseases. (GBD). Estudo de carga global de doença 2015: resumo dos métodos utilizados. Rev Bras Epidemiol. 2017;20(supl 1):4-20.

This study was aimed at comparing historical series of CVD mortality based on data from the SIM, with and without correction, and the Brazil GBD Study 2017 estimates.

Methods

This study assessed the historical series of CVD mortality in Brazil from 2000 to 2017. The data source for this study was the SIM, which contains the major information on death records in the whole country. Initially, the proportions of ill-defined causes of death in the SIM were described ( Figure 1 ).

Figure 1
Proportion of ill-defined causes of death in the Brazilian Information System on Mortality (SIM), Brazil, 2000 - 2017. Source: SIM.

Three estimates of CVD mortality were compared: Crude SIM, Corrected SIM, and Brazil GBD Study 2017. The estimates deriving from the SIM, with and without correction, named Corrected SIM and Crude SIM, respectively, used the definition of CVDs in accordance with the 10thRevision of the International Statistical Classification of Diseases and Related Health Problems (ICD-10) chapter IX codes (diseases of the circulatory system - I00-I99). The GBD classification considered initially the following codes: B33.2, G45-G46.8, I01-I01.9, I02.0, I05-I09.9, I11-I11.9, I20-I25.9, I28-I28.8, I30-I31.1, I31.8-I37.8, I38-I41.9, I42.1-I42.8, I43-I43.9, I47-I48.9, I51.0-I51.4, I60-I63.9, I65-I66.9, I67.0-I67.3, I67.5-I67.6, I68.0-I68.2, I69.0-I69.3, I70.2-I70.8, I71-I73.9, I77-I83.9, I86-I89.0, I89.9, I98, and K75.1.

Figure 2 shows the methods for correcting death and population data used to estimate the absolute numbers and mortality rates for the Crude SIM and Corrected SIM, as well as the GBD Study 2017 estimates. The numerator corresponds to the CVDs (I00-I99) registered by the SIM. The estimates generated by the Crude SIM were age-standardized, no other correction being applied. The estimates generated by the Corrected SIM were age-standardized and corrected as follows: for underreporting, by using the GBD methodology; for the deaths lacking information on age and sex, by using the proportional redistribution of these deaths; and for the ill-defined causes of death, by using the proportional redistribution of these causes in the groups of cardiovascular causes and the other ICD-10 chapters.44. Saltarelli RMF, Prado RR, Monteiro RA, Malta DC. Tendência da mortalidade por causas evitáveis na infância: contribuições para a avaliação de desempenho dos serviços públicos de saúde da Região Sudeste do Brasil. Rev Bras. Epidemiol.2019;22:e190020. The GBD 2017 estimates were extracted from the Institute for Health Metrics and Evaluation (IHME) database, underwent the previously described corrections, such as for underreporting, GC, and ill-defined causes of death, and were detailed in previous publications.77. Murray CJ, Ezzati M, Flaxman AD, Lim S, Lozano R, Michaud C, et al. GBD 2010: design, definitions, and metrics. Lancet. 2012;380(9859):2063-6. , 88. Naghavi M, Abajobir AA, Abbafati C, Abbas KM, Abd-Allah F, Abera SF, et al. Global, regional, and national age-sex specific mortality for 264 causes of death, 1980–2016: a systematic analysis for the Global Burden of Disease Study 2016. Lancet.2017;390(10100):1151-210. , 1010. Global Burden Diseases. (GBD). Estudo de carga global de doença 2015: resumo dos métodos utilizados. Rev Bras Epidemiol. 2017;20(supl 1):4-20.

Figure 2
Flowchart of the estimates of the Crude and Corrected Information System on Mortality and the Global Burden of Diseases Study, methods for correction and population used, for absolute numbers and mortality rates. CVD: Cardiovascular Diseases; IBGE: Brazilian Institute of Geography and Statistics; SIM: Brazilian Information System on Mortality; GBD: Global Burden of Diseases Study; IDCD: Ill-Defined Causes of Death.

Data from the Crude SIM and Corrected SIM were compared with the estimates of the GBD Study 2017, which also uses SIM data as a source, both by using the 2000-2017 historical series of the total of deaths and absolute numbers of the diseases listed in the ICD-10 IX chapter , and the age-standardized rates of the three estimates. To calculate the rates in the Crude SIM and the Corrected SIM, the updated population estimates generated by the Brazilian Institute of Geography and Statistics (IBGE) were used as denominator.1111. Instituto Brasileiro de Geografia e Estatística. (IBGE). Projeção da População Brasil e Unidades da Federação. Revisão 2018. Rio de Janeiro; 2018. However, that IBGE estimate only provides data from 2010 onwards; thus, two interpolations were applied: one with data from the year 2000 of the 2013 version made available by IBGE,1212. Instituto Brasileiro de Geografia e Estatística. (IBGE). Projeção da População Brasil e Unidades da Federação.; Rio de Janeiro; 2013. and another interpolation with data from the year 2010 of the current version made available in 2018.1111. Instituto Brasileiro de Geografia e Estatística. (IBGE). Projeção da População Brasil e Unidades da Federação. Revisão 2018. Rio de Janeiro; 2018. The standard population used to adjust the age-standardized rates, through the direct method, was the world population of the GBD Study.77. Murray CJ, Ezzati M, Flaxman AD, Lim S, Lozano R, Michaud C, et al. GBD 2010: design, definitions, and metrics. Lancet. 2012;380(9859):2063-6. To calculate the rates, the GBD Study considers its own population estimates (Source GBD). All three estimates were analyzed for the ICD-10 chapter IX codes (diseases of the circulatory system - I00-I99) from 2000 to 2017. Figure 2 shows the flowchart used to compare the three estimates, regarding the absolute numbers of deaths and mortality rates for Brazil, its states, and Federal District.

The analyses were performed using Stata Statistical Software: Release 14. College Station, TX: StataCorp LP.

Results

Figure 1 shows the proportion of ill-defined causes of death in relation to the total number of deaths in Brazil from 2000 to 2017. That proportion was 14.3% in 2000 and decreased over time, more abruptly from 2005 onward, reaching 5.5% in 2017.

Table 1 shows that a large number of deaths with underlying causes classified as ICD-10 chapter IX codes constituted GC, as by the definition of GC in the GBD Study 2017, and that proportion was 42.1% in 2017. In addition, Table 1 shows that the number of GC decreased slowly over the years, indicating an improvement in the quality of the definition of the ICD-10 chapter IX causes of death. The GBD Study redistributes the GC in its estimates.

Table 1
– Total of deaths, absolute numbers and percentages of deaths due to cardiovascular diseases according to the ICD-10 IX chapter codes (I00-I99) and to the definitions of GBD for cardiovascular diseases, and absolute numbers and percentages of garbage codes, in Brazil, 2000 to 2017

The absolute numbers of deaths due to CVD and standardized mortality rates of the Crude SIM, the Corrected SIM, and the GBD Study 2017 estimates were analyzed. Figure 3 depicts the absolute number of deaths due to CVD for the three estimates, with a similar increase for all three methods. The SIM registered approximately 261,000 deaths in 2000, reaching 359,000 deaths in 2017. After data correction, the SIM records ranged from 324,000 in 2000 to 397,000 in 2017. The GBD 2017 estimates increased from 292,000 deaths to 388,000 deaths in those same years.

Figure 3
Absolute numbers of cardiovascular disease deaths according to the Crude and Corrected SIM and the GBD Study 2017. Brazil, 2000 to 2017. Sources: SIM and Brazil GBD Study 2017.

The CVD mortality rates decreased in the period analyzed ( Figure 4 ). The Crude SIM rates decreased from 211.7 to 155.1 deaths per 100,000 inhabitants, while the Corrected SIM rates decreased from 263.9 to 172.0 deaths per 100,000 inhabitants. The GBD 2017 estimated rates decreased from 248.8 to 178,0 deaths per 100,000 inhabitants. However, it is worth noting that, from 2015 to 2017, the GBD estimated rates increased, and this increase was also observed in the Corrected SIM rates from 2015 to 2016.

Figure 4
Standardized cardiovascular disease mortality rates according to the Crude and Corrected SIM and the GBD Study 2017. Brazil, 2000 to 2017. Sources: SIM and Brazil GBD Study 2017.

When assessing the percentage variations in the standardized CVD mortality rates from 2000 to 2017 by each state and the Federal District, there was a difference in the Crude SIM data, with stabilization in the rates or their increase (of as much as 115%) in most Northern and Northeastern states. That pattern is observed neither in the Corrected SIM data nor in the GBD Study data, whose rates showed a reduction in all Brazilian states and the Federal District ( Figure 5 , Table 2 ).

Figure 5
Percentage variation of standardized cardiovascular mortality rates from 2000 to 2017. Sources: SIM and Brazil GBD Study 2017.

Table 2
– Standardized cardiovascular disease mortality rates for Brazil, its states and Federal District, in the years 2000 and 2017, as well as their percentage variations in the period

Discussion

This study compares three different methods to estimate the historical series of CVD mortality in Brazil from 2000 to 2017, which decreased, except for the period from 2015 onwards, when there was an increase in the GBD estimated rates and stability in the Corrected SIM rates. The estimates of the Corrected SIM and GBD were similar, especially after 2006, when the quality of the SIM improved. The Crude SIM showed an increase in the rates of the Northern and Northeastern states, while the Corrected SIM and GBD showed a reduction in the rates of all states and the Federal District in the period.

Cardiovascular diseases are the number one cause of death globally1313. World Health Organization.(WHO) Global Action Plan for the Prevention and Control of NCDs 2013-2020. Geneva; 2013. and in Brazil,55. Marinho FM, Passos V. Malta DC, Barbosa FE, Abreu DMX. Burden of disease in Brazil, 1990-2016: a systematic subnational analysis for the Global Burden of Disease Study 2016. Lancet. 2018 Sep 1;392(10149):760-75. , 1414. Schmidt MI, Duncan BB, Azevedo e Silva G, Menezes AM, Monteiro CA, et al. Chronic noncommunicable diseases in Brazil: burden and current challenges. Lancet 2011; 377(9781):1949-61. corresponding to one third of all deaths. All regions showed a decline in mortality due to chronic non communicable diseases (CNCDs). The CVDs and their complications have a high impact on the loss of productivity in the workplace and in the family income, resulting in a US$ 4.18 billion deficit in the Brazilian economy from 2006 to 2015.1515. Abegunde DO, Mathers CD, Adam T, Ortegon M, Strong K. The burden and costs of chronic diseases in low-income and middle-income countries. Lancet 2007;370(9603):1929-38. Studies conducted in several countries have shown a reduction in the incidence of CVDs and in CVD mortality since the 1960s.1616. World Health Organization. (WHO). Global status report on noncommunicable diseases 2010. Geneva; 2011. 176p. , 1717. Kochanek KD, Murphy SL, Tejada-Vera B. Deaths: Final Data for 2007: National Vital Statistics Reports Hyattsville. Natl Vital Stat Rep. 2010;58(19):1-19. In Brazil, that reduction occurred later, in the 1990s.55. Marinho FM, Passos V. Malta DC, Barbosa FE, Abreu DMX. Burden of disease in Brazil, 1990-2016: a systematic subnational analysis for the Global Burden of Disease Study 2016. Lancet. 2018 Sep 1;392(10149):760-75. , 1414. Schmidt MI, Duncan BB, Azevedo e Silva G, Menezes AM, Monteiro CA, et al. Chronic noncommunicable diseases in Brazil: burden and current challenges. Lancet 2011; 377(9781):1949-61.

Over the years, SIM has been improved, having its coverage increased and the quality of the reports of underlying causes of death in death certificates refined. These advances have resulted from the efforts of the Brazilian Ministry of Health in partnership with states and municipalities to improve death data collection by the SIM. Some examples are the 2005 Project to Reduce Ill-Defined Causes and the Projects to Reduce Regional Inequalities and Child Mortality in the Northeastern states and the ‘Legal Amazonia’ region.1818. Brasil. Ministério da Saúde. Saúde Brasil 2015/2016 : uma análise da situação de saúde. Brasilia; 2017. 386p. It is worth noting the Project of Active Search for Death Data, which enabled the definition of methodologies to redistribute underreported deaths.1919. Frias, PG, Szwarcwald, C L, Morais Neto OL, Leal MC, Cortez-Escalante J J, Souza Jr PR, et al. Utilização das informações vitais para a estimação de indicadores de mortalidade no Brasil: da busca ativa de eventos ao desenvolvimento de métodos. Cad Saúde Pública, 2017; 33(3):e00206015.. , 2020. Almeida WS, Szwarcwald, CL. Adequação das informações de mortalidade e correção dos óbitos informados a partir da Pesquisa de Busca Ativa. Ciênc. Saúde Coletiva. 2017;22(10):3193-203. Those corrections are essential for the accurate interpretation and comparability of historical series in different regions of Brazil.

It is worth noting the important reduction in the percentage of ill-defined causes of death in the SIM, which results from the improvement in the quality of healthcare services and the increase in healthcare coverage, especially the advance of the family healthcare team to inner areas of the country.55. Marinho FM, Passos V. Malta DC, Barbosa FE, Abreu DMX. Burden of disease in Brazil, 1990-2016: a systematic subnational analysis for the Global Burden of Disease Study 2016. Lancet. 2018 Sep 1;392(10149):760-75.

In addition, the differences between the Corrected SIM and the GBD Study 2017 can be explained by the percentage of the codes of unspecific causes, named ‘garbage code’ in the international literature.88. Naghavi M, Abajobir AA, Abbafati C, Abbas KM, Abd-Allah F, Abera SF, et al. Global, regional, and national age-sex specific mortality for 264 causes of death, 1980–2016: a systematic analysis for the Global Burden of Disease Study 2016. Lancet.2017;390(10100):1151-210. Although the rates provided by the Corrected SIM were not corrected by the redistribution of GC, all GBD Study estimates were corrected for death underreporting and redistribution of ill-defined causes and of GC. Thus, the GBD estimated rates differ from those of the other methods that do not use GC redistribution. Some examples of GC causes are as follows: septicemia; cardiac arrest; dehydration; congestive heart failure. They are part of the train of events leading to death, but are not the underlying cause of death.88. Naghavi M, Abajobir AA, Abbafati C, Abbas KM, Abd-Allah F, Abera SF, et al. Global, regional, and national age-sex specific mortality for 264 causes of death, 1980–2016: a systematic analysis for the Global Burden of Disease Study 2016. Lancet.2017;390(10100):1151-210. For the GC redistribution, the GBD Study uses algorithms based on medical literature evidence, multiple sources, expert opinions, analysis of multiple causes, and mainly on statistical modelling techniques to define the weight of assigning each GC to the most probable underlying cause of death, called target . 66. Ishitani LH, Teixeira RA, Abreu DMX, Paixão LMMM, França EB. Qualidade da informação das estatísticas de mortalidade: códigos garbage declarados como causas de morte em Belo Horizonte, 2011-2013. Rev Bras. Epidemiol. 2017;20(Suppl 1):34-45. 20(Suppl 1):34-45. , 88. Naghavi M, Abajobir AA, Abbafati C, Abbas KM, Abd-Allah F, Abera SF, et al. Global, regional, and national age-sex specific mortality for 264 causes of death, 1980–2016: a systematic analysis for the Global Burden of Disease Study 2016. Lancet.2017;390(10100):1151-210.

The SIM is a consolidated system, which the Brazilian Ministry of Health has been perfecting via processes of validation of internal inconsistencies and improvement in death reporting. However, the classification requires refinement, especially regarding the reduction in GC. When comparing the mortality estimates of the GBD Study with the Crude SIM data, the differences observed are due to age and sex inconsistencies related to causes of death, underreporting, and GC redistribution . The GC redistribution has the greatest influence on the difference between corrected estimates and crude ones. Level 1 and level 2 GC, those with little specification of the real cause of death, correspond to 12% of the SIM records. When level 3 and level 4 GC are considered to be redistributed in the same group of causes, that is, with better specification of the cause of death, the GC can reach 40%, which can lead to differences in the estimates between the SIM and the GBD.66. Ishitani LH, Teixeira RA, Abreu DMX, Paixão LMMM, França EB. Qualidade da informação das estatísticas de mortalidade: códigos garbage declarados como causas de morte em Belo Horizonte, 2011-2013. Rev Bras. Epidemiol. 2017;20(Suppl 1):34-45. 20(Suppl 1):34-45. , 88. Naghavi M, Abajobir AA, Abbafati C, Abbas KM, Abd-Allah F, Abera SF, et al. Global, regional, and national age-sex specific mortality for 264 causes of death, 1980–2016: a systematic analysis for the Global Burden of Disease Study 2016. Lancet.2017;390(10100):1151-210.

This study indicates that the Crude SIM analyses are biased, especially for the Northern and Northeastern states. Therefore, its adoption is not recommended, especially for the definition of regional policies, because the rates are subject to estimation errors, such as those due to underreporting and excessive proportion of ill-defined causes. Methodological adjustments to coverage and redistribution of ill-defined causes are necessary, even more when it comes to the analysis of historical series, involving a period in which the quality of SIM was impaired.

In 2015, the United Nations Assembly approved the Sustainable Development Goals, representing 17 global challenges to achieve a better and more sustainable future for all. One of the goals is to ensure good health and well-being for all, at all ages. It includes the indicator “a 30% reduction in premature mortality from CNCDs by 2030”, whose calculation involves a reduction in CVDs. Reducing CNCDs and CVDs is a global challenge.2121. United Nations (UN). Transforming our world: the 2030 Agenda for Sustainable Development. New York;2015.

22. Malta DC, Duncan BB, Barros MBA, Katikireddi SV, Souza FM, Silva AG. et al . Medidas de austeridade fiscal comprometem metas de controle de doenças não transmissíveis no Brasil. Ciênc. saúde coletiva .2018;23(10):3115-22.
- 2323. Beaglehole R, Bonita R, Horton R, Ezzati NB, Bhala N, Amuyunzu-Nyamongo M, et al. Measuring progress on NCDs: one goal and five targets. Lancet. 2012; 380(9850):1283-5.

To meet the goal to prevent and control CNCDs, the World Health Organization has issued a document recommending the adoption of interventions for health promotion, with the implementation of public policies within and across sectors that promote healthy practices, such as healthy diets, low-sodium food products, open public spaces and adequate infrastructure to support physical activity, smoke-free environments, and alcohol advertising regulation.2424. World Health Organization. (WHO). Best Buys and Other Recommended Interventions for the Prevention and Control of Noncommunicable Diseases Updated. 2017. Geneva; 2017. In addition, it is worth noting the importance of investing in primary care and access to medium and high complexity technologies, when necessary, aimed at the whole care of patients with CNCDs.2525. Rasella D, Basu S, Hone T, Paes-Sousa R, Ocke´-Reis CO, Millett C. Child morbidity and mortality associated with alternative policy responses to the economic crisis in Brazil: A nationwide microsimulation study. PLoS Med . 2018; 15(5):e1002570.

This study shows an increase (GBD 2017) or stability (Corrected SIM) in the mortality rates due the CVD from 2015 onwards. These data need to be revised because of the short period analyzed. However, other studies have reported worsening of health indicators in Brazil, which has been attributed to the economic crisis, the increase in poverty, and the cuts in health and social policies resulting from the Constitutional Amendment 95/2016 and the freeze on public expenses, health included, for 20 years.2222. Malta DC, Duncan BB, Barros MBA, Katikireddi SV, Souza FM, Silva AG. et al . Medidas de austeridade fiscal comprometem metas de controle de doenças não transmissíveis no Brasil. Ciênc. saúde coletiva .2018;23(10):3115-22.

23. Beaglehole R, Bonita R, Horton R, Ezzati NB, Bhala N, Amuyunzu-Nyamongo M, et al. Measuring progress on NCDs: one goal and five targets. Lancet. 2012; 380(9850):1283-5.

24. World Health Organization. (WHO). Best Buys and Other Recommended Interventions for the Prevention and Control of Noncommunicable Diseases Updated. 2017. Geneva; 2017.
- 2525. Rasella D, Basu S, Hone T, Paes-Sousa R, Ocke´-Reis CO, Millett C. Child morbidity and mortality associated with alternative policy responses to the economic crisis in Brazil: A nationwide microsimulation study. PLoS Med . 2018; 15(5):e1002570.

This study has limitations. The use of secondary databases can add biases, such as underreporting and inconsistencies in death certificate completion. In addition, the Brazilian population estimates may be subject to errors, as the last available census in Brazil dates back to 2010. Moreover, the GBD estimates might have limitations because of its sources, adjustments, and algorithms used.

Conclusion

This study shows the decline in the CVD mortality rates in the period analyzed, except for the last two years. The comparison of the estimates shows similarities between the Corrected SIM and the GBD Study 2017. However, the use of the Crude SIM data is not recommended, especially for subnational analyses, because it can result in interpretation errors. In this study, the increase in mortality rates might have reflected the improvement in death data capture and in the definition of the underlying causes of death in the past decade, especially in the Northern and Northeastern regions. This justifies the recommendation to always use corrected data for mortality analyses.

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  • Study Association
    This study is not associated with any thesis or dissertation work.
  • Sources of Funding
  • Ministerio da Saúde – Fundo Nacional de Saúde – TED 148/2018. Dr. Ribeiro was supported in part by CNPq (Bolsa de produtividade em pesquisa, 310679/2016-8 and IATS, project: 465518/2014-1) and by FAPEMIG (Programa Pesquisador Mineiro, PPM-00428-17). Malta DC was supported in part by CNPq (Bolsa de produtividade em pesquisa) and by FAPEMIG (Programa Pesquisador Mineiro).

Publication Dates

  • Publication in this collection
    28 Aug 2020
  • Date of issue
    Aug 2020

History

  • Received
    04 Dec 2019
  • Reviewed
    21 Feb 2020
  • Accepted
    16 Mar 2020
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