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      The use of simplified verbal autopsy in identifying causes of adult death in a predominantly rural population in Ethiopia

      research-article
      1 , 2 ,
      BMC Public Health
      BioMed Central

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          Abstract

          Background

          Information on adult mortality is essentially non-existent in Ethiopia particularly from rural areas where access to health services is limited and most deaths occur at home. This study was conducted with the aim of identifying causes of adult death in a rural population of Ethiopia using a simplified verbal autopsy instrument.

          Methods

          All deaths in the age-group 15–49 years during the period of 1995–99 were taken from computerized demographic surveillance database maintained by the Butajira Rural Health Program. Data on the causes of death were collected from close relatives of the deceased persons by lay interviewers. Causes of death were diagnosed using "expert algorithm" programmed onto a computer.

          Results

          The major causes of death were acute febrile illnesses (25.2%), liver diseases (11.3%), diarrheal diseases (11.1%), tuberculosis (9.7%) and HIV/AIDS (7.4%). Overall communicable diseases accounted for 60.8% of the deaths. The high levels of mortality from communicable diseases reflect the poor socioeconomic development of the country, and the general poor coverage of health and education services in rural Ethiopia. The tools used in this study can easily be added-on to the numerous health surveys conducted in the country.

          Conclusion

          The simplified approach to verbal autopsy diagnosis can produce useful data that can effectively guide priority health interventions in rural areas where routine information system is either very weak or non-existent.

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          Most cited references25

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          Childhood deaths in Africa: uses and limitations of verbal autopsies.

          The verbal autopsy (VA) is an epidemiological tool that is widely used to ascribe causes of death by interviewing bereaved relatives of children who were not under medical supervision at the time of death. This technique was assessed by comparison with a prospective survey of 303 childhood deaths at a district hospital in Kenya where medically confirmed diagnoses were available. Common causes of death were detected by VA with specificities greater than 80%. Sensitivity of the VA technique was greater than 75% for measles, neonatal tetanus, malnutrition, and trauma-related deaths; however, malaria, anaemia, acute respiratory-tract infection, gastroenteritis, and meningitis were detected with sensitivities of less than 50%. There may have been unwarranted optimism in the ability of VAs to detect some of the major causes of death, such as malaria, in African children. VA used in malaria-specific intervention trials should be interpreted with caution and only in the light of known sensitivities and specificities.
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            Diagnostic accuracy of physician review, expert algorithms and data-derived algorithms in adult verbal autopsies.

            The verbal autopsy (VA) is used to collect information on cause-specific mortality from bereaved relatives. A cause of death may be assigned by physician review of the questionnaires, or by an algorithm. We compared the diagnostic accuracy of physician review, an expert algorithm, and data-derived algorithms. Data were drawn from a multicentre validation study of 796 adult deaths that occurred in hospitals in Tanzania, Ethiopia, and Ghana. A 'gold standard' cause of death was assigned using hospital records and death certificates. The VA interviews were carried out by trained fieldworkers 1-21 months after the subject's death. A cause of death was assigned by physician review and an expert algorithm. Data-derived algorithms that most accurately estimated the cause-specific mortality fraction (CSMF) for each cause of death were identified using logistic regression. The most common causes of death were tuberculosis/AIDS (CSMF = 18.6%), malaria (CSMF = 10.7%), meningitis (CSMF = 8.3%), and cardiovascular disorders (CSMF = 8.2%). The CSMF obtained using physician review was within +/-20% of the gold standard value for 12 causes of death including the four common causes. The CSMF obtained using the expert algorithm was within +/-20% of the gold standard for eight causes of death, including tuberculosis/AIDS, malaria, and meningitis. The CSMF obtained using the data-derived algorithms was within +/-20% of the gold standard for seven causes of death, including tuberculosis/ AIDS, meningitis, and cardiovascular disorders. All three methods yielded a specificity of at least 80% for all causes of death, and a sensitivity of at least 80% for deaths due to injuries and rabies. For those settings where physician review is not feasible, expert and data-derived algorithms provide an alternative approach for assigning many causes of death. We recommend that the algorithms proposed herein are validated further.
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              Verbal autopsies for adult deaths: issues in their development and validation.

              The verbal autopsy appears to be an attractive technique for the assessment of causes of adult death in settings where the proportion of people who die while under medical care is low. Verbal autopsies have been used extensively to assess causes of childhood deaths. The existing experience in verbal autopsies for adult deaths is limited mainly to maternal deaths. This paper aims to highlight the critical issues in verbal autopsies to assess causes of adult death which need further research. This paper reviews the methods of verbal autopsy used in 35 published studies and discusses issues in the development of verbal autopsies, including mortality classification, design of questionnaires, interviewers, respondents, recall periods, procedures for deriving a diagnosis and the recording of single versus multiple causes of death. It also discusses issues in the validation of verbal autopsies, including the choice of reference diagnosis and the required sample size. The methodological approaches used in verbal autopsy studies have varied widely. Very few studies of the validity of verbal autopsies have been conducted. In these studies, the reported sensitivity and specificity varied widely between different causes of death and between studies. The information available is inadequate to draw firm conclusions on preferred methodological approaches for verbal autopsies for adult deaths. Before these tools are used more widely for adult deaths, further research is required to compare alternative methods and to evaluate the validity of this tool in a range of settings.
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                Author and article information

                Journal
                BMC Public Health
                BMC Public Health
                BioMed Central (London )
                1471-2458
                2005
                3 June 2005
                : 5
                : 58
                Affiliations
                [1 ]Department of Community Health, Jimma University, Jimma, Ethiopia
                [2 ]Department of Community Health, Faculty of Medicine, Addis Ababa University, P.o. Box 2077, Addis Ababa, Ethiopia
                Article
                1471-2458-5-58
                10.1186/1471-2458-5-58
                1164421
                15935096
                b57f5408-032c-460c-93e6-83c8e18df890
                Copyright © 2005 Lulu and Berhane; licensee BioMed Central Ltd.

                This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 15 September 2004
                : 3 June 2005
                Categories
                Research Article

                Public health
                Public health

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