Differences in diabetic co-morbidity between Aboriginal and non-Aboriginal people living in Bella Coola, Canada
Citation: Thommasen HV, Patenaude J, Anderson N, Mc Arthur A, Tildesley H. Differences in diabetic co-morbidity between Aboriginal and non-Aboriginal people living in Bella Coola, Canada. Rural and Remote Health 4: 319. (Online) 2004. Available: http://www.rrh.org.au
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Introduction: Objectives: (1) To identify which medical disorders are significantly associated with being a diabetic in the setting of an isolated, rural community; and (2) to determine if there are differences between Aboriginal and non-Aboriginal diabetics.
Methods: Design: population based retrospective chart review. Study population: people living in the Bella Coola Valley, Canada, and having a chart at the Bella Coola Medical Clinic as at September 2001. Main outcome measures: known diabetes related co-morbidity (retinopathy, nephropathy, coronary artery disease, peripheral vascular disease, neuropathy).
Results: There were 126 adult (>18 years old) diabetics living in the Bella Coola Valley. Prevalence rates for history of alcohol issues, retinopathy, coronary artery disease, cerebrovascular disease, peripheral vascular disease, peripheral neuropathy, hypertension, hypercholesterolemia, and nephropathy were 44%, 14%, 19%, 8%, 7%, 10%, 54%, 47%, and 7% respectively. For the 1597 non-diabetics living in the Bella Coola Valley, respective prevalence rates for these same co-morbidities were 20%, 0.3%, 2%, 1.5%, 1%, 1%, 10%, 6%, and 0.6%. The study did not demonstrate that Aboriginal people living in the Bella Coola Valley have an increased prevalence of diabetes associated co-morbidities over and above that found in the non-Aboriginal diabetic population. This was despite the fact the smoking rate was higher in the Aboriginal population.
Conclusion: The development of diabetes in both Aboriginal and non-Aboriginal people living in the Bella Coola Valley was clearly associated with the presence of multiple co-morbidities, including hypertension, hypercholesterolemia, coronary artery disease, cerebrovascular disease, and neuropathy. Rates of diabetes associated co-morbidities were similar for both Aboriginal and non-Aboriginal diabetic populations. The authors speculate that a diet rich in fish oils (omega-3 fatty acids) accounted for the lower than expected rates of cardiovascular disease among this Aboriginal population.
Key words: Aboriginal research, diabetes mellitus, diabetes related disease and morbidity, rural community.
Diabetes mellitus is an important cause of death, illness and disability in Canada. It affects approximately 5% of adults, which equates to over one million Canadians1,2. Having diabetes substantially increases one’s risk of developing blindness, end stage renal disease, lower limb amputations, and dying from coronary artery disease, stroke, or peripheral vascular disease3,4. Recent studies have shown that keeping blood sugar levels within normal range reduces chances of developing at least some of the complications associated with having diabetes5-7.
Consequently, an important aspect of type 2 diabetes treatment is lowering blood sugar levels through diet, exercise, and medications8-12. Comprehensive management of diabetic patients also includes monitoring blood pressure and lipids, encouraging smoking cessation, and the prophylactic use of acetylsalicylic acid (ASA)2. According to practice guidelines, initial and ongoing education of the patient with diabetes should be an integral part of diabetes management and not merely an adjunct to treatment. Whenever possible, diabetic patients should receive dietary advice from a registered dietician1,2,13. In addition to these recommendations, Aboriginal people have been singled out as deserving special attention – earlier screening and more aggressive medical management of relatively high blood pressure, blood glucose, and cholesterol levels2.
Type 2 diabetes has gone from being nearly nonexistent in the North American native Indian population in 1940 to current epidemic proportions14-19. According to a report published by Health Canada the prevalence rate of diabetes among the First Nations people in Canada is twice that of the general population of Canada17. Type 2 diabetes is of particular concern to Aboriginal people because of earlier onset, and higher rates of complications, co-morbidities, and diabetes related death seen in this population. Diabetes associated co-morbidities and complications which occur at rates higher than expected within the Aboriginal diabetic population include hypertension, obesity, cardiovascular disease, cerebrovascular disease, end-stage renal disease, lower leg amputations, and diabetic retinopathy, which all contribute to shortened life span reported for Aboriginal people16,18-21. For example, a study of diabetics living in Kahnawake (a Mohawk Indian community located near Montreal, Quebec) revealed that 13% had a history of stroke, versus 3% for the non-diabetic Kahnawake population; over half this diabetic population had coronary artery disease; 25% developed retinopathy after 10 years; and over 60% of this diabetic population had at least one major complication. The high rates of diabetes-related complications and co-morbidities have been attributed to earlier onset of disease coupled with a systemic failure to make the diagnosis in a timely fashion. According to the 2000/2001 Canadian Community Health Survey, Canadians living in rural and northern areas have higher rates of smoking, obesity, major depression, high blood pressure, and arthritis22. This is consistent with other studies that show rural residents have higher rates of chronic disease, rural residents report being ill more frequently, and they are more likely to report poorer health status23-26. Poorer health among rural residents has in turn been attributed to less education, lower income, and greater proportion of First Nations people in this population23,27-31. A possible factor is that rural residency is an important confounder in data reporting poor health for Aboriginal people; this needs to be examined more closely.
While there is quite a bit of information on health and prevalence of diabetes and other chronic disease for Canada’s Aboriginal people, much of this information comes from self-reported data; in particular the 1991 Aboriginal Peoples Survey, and the 1997 First Nations and Inuit Regional health Survey which had a adequate total numbers, but relatively low regional response rates17,21. The community-based data which does exist, comes almost entirely from eastern Aboriginal communities. This is despite the fact that one-third of Canada’s pre-contact Aboriginal population lived within British Columbia; and seven of 11 language families spoken within Canada were being spoken in British Columbia at the time of European contact32. Diabetes prevalence data from British Columbia suggests diabetes prevalence rates in this province for Aboriginal people are among the lowest in all of Canada18,33-35. A 1990 study showed that the prevalence rates of diabetes varied greatly among the provinces and territories, with the Atlantic Provinces and Ontario having the highest rates, at 8.7% and 7.6%, respectively, while British Columbia, the Yukon and Northwest Territories had the lowest, at 1.6%, 1.2% and 0.8% respectively33. While the overall prevalence rate for diabetes in British Columbia is relatively low, recent studies demonstrate significant regional differences within the province34,35.
Bella Coola Valley is a remote community located in the central coast region of British Columbia, Canada (Fig 1)36. While Bella Coola and Hagensborg are the two largest communities in this valley, there are a few houses in Stuie, and a few seasonal cabins located in Atnarko (Fig 1). According to the 2001 Census, 2285 people live in the Bella Coola Valley, and 46% of these people are of Aboriginal descent37,38. Bella Coola Valley is part of the traditional territory of the Nuxalk Nation, a tribe of Salish-speaking Coastal Indians39-41.
Figure 1: Map of the study area.
The crude prevalence of diabetes in the Aboriginal population is more than one and half times that of the non-Aboriginal population (9.7% vs 5.7%). However, when the differences in the age distribution of the Aboriginal and non-Aboriginal populations are considered, and the prevalence rates are adjusted, the prevalence of diabetes in the Aboriginal population is more than two and half times that of the non-Aboriginal population (12.5% vs 4.8%)42. Age, weight, Aboriginal status are all associated with having diabetes in this population42. An individual's sex was not associated with having diabetes in either the Aboriginal or non-Aboriginal population.
The research question of this study is: are there differences in diabetes related co-morbidity (eg, eye, kidney, heart, vascular, neurologic) prevalence rates between Aboriginal and non-Aboriginal diabetics living in the Bella Coola Valley, Canada?
This research project has been carried out in a participatory fashion, following the recommendations outlined in a recently published policy statement entitled 'A Guide for Health Professionals Working with Aboriginal Peoples'43-45. There was consultation with the Nuxalk Band Council, community members and local health care providers on our plans to study determinants of health and disease of people living in the Bella Coola valley. Prior to collecting data we obtained letters of support from the Nuxalk Band Council, from the Bella Coola Transitional Health Authority, and from Central Coast Regional District. Ethics approval to collect data was obtained from Research Ethics Committees located at both the University of British Columbia, and at the University of Northern British Columbia. The results and the manuscript were reviewed and approved for publication by both Nuxalk Health professionals and United Church Health Services health professionals.
Aboriginal status for the study population was determined from multiple sources: Nuxalk Band lists, a locally available genealogy, clinic chart, and a recent survey46. It was found that 47% of the people living in the Bella Coola Valley were of Aboriginal decent which is similar to the 2001 census estimate (46%)37,38. The total clinic population was 2376 people, which is slightly higher than the 2001 Census estimate. Of the 2376 clinic population, 1723 were adults (>18 years old), and 126 of these adults had diabetes mellitus. All 126 diabetics had been classified as having type 2 diabetes. At the time of the study, there was only one type 1 diabetic living in the Bella Coola Valley and that person was less than 18 years of age when the data for this study was collected. The presence of diabetes was based on a physician diagnosis of diabetes which, in turn, was based on the 1998 clinical practice guidelines for the management of diabetes in Canada2,47. The presence or absence of a variety of chronic diseases/co-morbidities was also noted during the chart review. Whether or not the adult smoked, was a former smoker, or had ever smoked was also noted, but the accuracy of these data was uncertain because the clinic has never made a concerted effort to record smoking status of its patients; also, the authors could not be certain whether a subject was a former smoker if the chart note simply stated 'not smoking'.
Chart-derived information was entered into an electronic EXCEL spreadsheet from which results were summarized, and graphs created; the data were sent to statisticians and other researchers for further analyses48. The data were analyzed using the software SPSS (SPSS Inc, Chicago, IL, USA) for Windows. Differences in the prevalence of chronic disease/co-morbidities between ethnic groups (Aboriginal vs others), and between people with or without diabetes were evaluated using Pearson’s c2 test49.
The average age of the adult (>18 years old) diabetic population (n = 126) was 60.2 + 12.3 (SD) years, and the average age of the non-diabetic adult (>18 years old) population (n = 1597) was 43.4 + 15.9 years.
The prevalence of various co-morbidities in the >18 year old diabetic and non-diabetic populations (Table 1). Having a diagnosis of diabetes was clearly associated with increased prevalence of many different co-morbidities including history of alcohol issues, retinopathy, renal disease, coronary artery disease, cerebrovascular disease, peripheral vascular disease, peripheral neuropathy, hypertension and hypercholesterolemia.
Table 1: Prevalence of co-morbidity/chronic disease by age and diabetic status
Stratifying by diabetic status and then comparing co-morbidity rates revealed a greater proportion of Aboriginal people had a history of alcohol issues whether they were diabetic or not; a greater proportion of non-Aboriginal adults had hypertension whether they were diabetic or not; and a greater proportion of non-Aboriginal non-diabetics had hypercholesterolemia compared with Aboriginal non-diabetics (Table 2).
Table 2: Co-morbidity stratified by diabetic status for Aboriginals and non-Aboriginals
Smoking status of the clinic population is summarized (Table 3). At least 35% of Bella Coola adults smoked tobacco. Having diabetes did not alter this smoking rate much. Proportionately, more Aboriginal people smoked compared with non-Aboriginal people. Smoking status could not be determined in 34% of the charts reviewed.
Table 3: Smoking Status of Bella Coola Valley adults
The information presented in this paper contributes to the scant knowledge which currently exists on the topic of Aboriginal diabetes related complications/co-morbidities for specific Western Aboriginal populations/communities43. The findings support previous literature which suggested diabetes is strongly associated with co-morbidities such as hypertension, hypercholesterolemia, and multiple end-organ diseases, for example coronary artery disease, retinopathy, nephropathy, and peripheral vascular disease.
The First Nations and Inuit Regional Health Survey (FNIHS) reported that diabetes, heart problems, and hypertension rates for First Nations people living on reserve were all increased up to three-fold, compared with the general Canadian population20,21.
Other studies have shown that rates of cerebrovascular disease, limb amputations, nephropathy, and retinopathy are all increased in Aboriginals, compared with the general Canadian population.
In the Bella Coola Valley, diabetes but not heart disease or hypertension prevalence is increased in the Aboriginal population. For example, the FNIHS reported 48% of Aboriginal diabetics had hypertension. In the Bella Coola Valley 43%, 68%, 5% and 13% of Aboriginal diabetics, non-Aboriginal diabetics, Aboriginal non-diabetics, and non-Aboriginal non-diabetics, respectively had a diagnosis of hypertension. A recent review of deaths in the Bella Coola Valley and Bella Coola Valley Health Area (LHA 49) between the years 1986 and 2001, revealed that compared with British Columbia non-Status Indian population, the standardized mortality ratio (SMR) for both Status Indian and residents who were not Status Indian was 1.4. The SMR for Status Indian residents living in the Bella Coola Valley dying from diabetes, circulatory diseases, ischemic heart disease, and cerebrovascular disease was 1.1, 0.9, 1.0 and 0.8 respectively. The SMR for residents who were not Status Indian for deaths due to diabetes, circulatory diseases, ischemic heart disease, and cerebrovascular disease was 0.9, 1.5, 1.4 and 2.6 respectively. None of the SMR reported for either Bella Coola Valley populations was statistically different from rates reported for the British Columbia non-Status Indian population50.
Failure to demonstrate increased diabetes or circulatory disease SMR, or increased prevalence rates of circulatory disease, ischemic heart disease, and cerebrovascular disease among the Bella Coola Aboriginal population is all the more surprising considering the fact that the smoking rate in this population exceeds the rate for non-Aboriginal Bella Coola Valley adult residents. Our chart-derived smoking rates were almost identical to those reported from a recent Bella Coola Valley health survey46. That survey reported a smoking rate of 34% for the entire adult population (Aboriginal and non-Aboriginal) and a smoking rate of 49% for the Bella Coola Valley Aboriginal adult population. According to our chart review, 35% of Bella Coola Valley adults currently smoke, and 46% of Aboriginal adults smoke. The aboriginal diabetic population has a smoking rate which exceeds 41%. Smoking rates in the Bella Coola Valley exceeds reported provincial and Canadian smoking rates22,46,51-52. Estimated smoking rate for Aboriginal people living in British Columbia51 is 43%, for the general British Columbia population51 it is 22%, and for the general Canadian population52 it is approximately 26%. According to the 2000/2001 Canadian Community health Survey, 33.5% of Canadians living in northern regions smoke and 32% of those in rural regions smoke22.
Salmon species (Onchorinchus sp.) and ooligans (Tahleichthys pacificus) are among the most heavily used food groups in the diet of Bella Coola Aboriginal residents. Perhaps the lower than expected cardiovascular disease rate is due to an above average consumption of dietary fish oils53-56. Dietary fish oils are rich in omega-3 polyunsaturated fatty acids which are believed to have numerous cardio-protective effects57. In 1985, Barr and Kuhnlein published information on high-density lipoprotein and total serum cholesterol levels for 202 members of the Nuxalk Nation and found that high density cholesterol levels were higher than expected53. They speculated that this finding might explain why British Columbia’s west coast native people had lower coronary mortality rates than the general population at that time. A detailed study on the cholesterol profile in this population is indicated. Genetic differences may also contribute in some type of cardio-protective way in this Bella Coola Aboriginal population. This is also an area which warrants further investigation.
The finding that a history of alcohol abuse is strongly associated with the development of diabetes mellitus in both Aboriginal and non-Aboriginal populations raises the possibility that alcohol abuse is an under-appreciated contributor to high rates of diabetes reported in some Aboriginal populations58.
Findings such as ours could arise if the health care system preferentially screens and manages one population over another. Canada has a Universal Health Care system whereby access to hospital and medical services is considered to be a fundamental human right. In theory, the poorest Canadians should experience the same level of care as the wealthiest59. Our study populations were drawn from Bella Coola Valley residents who had been screened for non-insulin dependent diabetes mellitus. Although there was a push to screen all adults in this community for non-insulin dependent diabetes mellitus, this has not been successfully completed yet. The overall screening rate for diabetes in the adult Bella Coola Valley population is approximately 62%. The screening rate for adult Aboriginals is only slightly higher than that for adult non-Aboriginal people (65% vs 60%) which probably reflects the fact that current guidelines suggest Aboriginal people should be screened 5 to 10 years earlier than non-Aboriginal people1,2. As shown, older persons are much more likely to have a clinic chart blood glucose value than a younger person (Table 4).
Table 4: Percentage of charts with glucose screening
Co-morbid conditions such as obesity could account for some of the differences between Aboriginal and non-Aboriginal populations. We do know from another study that more Aboriginal (65%) than non-Aboriginal people (47%) living in the Bella Coola are overweight (defined as a BMI >27); and we do know that the proportion of population that were overweight increased with age42,60. However, logistic modeling confirms Aboriginal status is a risk factor for diabetes over above weight and age risk factors (Appendix I).
Our data suffer from limitations inherent in collecting medical chart information, especially incomplete information and non-standardized measurements. Reliability of the data could have been strengthened by having an independent review of a random sample of charts to assess for congruent findings among reviewers.
In summary, the present research provides baseline rates for diabetes related co-morbidity for the Aboriginal and non-Aboriginal peoples living in the Bella Coola Valley.
The development of diabetes in both Aboriginal and non-Aboriginal people living in the Bella Coola Valley is clearly associated with the presence of multiple co-morbidities including hypertension, hypercholesterolemia, coronary artery disease, cerebrovascular disease, nephropathy, and neuropathy. Surprisingly, we were unable to demonstrate that Aboriginal people living in the Bella Coola Valley have an increased prevalence of diabetes-associated co-morbidities over and above that found in the non-Aboriginal diabetic population. We speculate that a diet rich in fish oils (omega-3 fatty acids) may account for the lower than expected rates of cardiovascular disease.
The authors would like to thank Rhonda Elliott for her assistance with the chart review process. The authors would also like to acknowledge the support of Bill Tallio, Director of Nuxalk Wellness Program, and Dr R McIlwain, Director, United Church Health Services for their support of this project. UBC Family Practice Research Department; and UNBC provided research funding for this project. Dr Thommasen would like to acknowledge the Vancouver Foundation’s Community-Based Clinician-Investigator Program for providing financial support.
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© Harvey Thommasen, Jana Patenaude, Nancy Anderson, Amy Mc Arthur, Hugh Tildesley 2004 A licence to publish this material has been given to ARHEN, http://www.arhen.org.au
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