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Exploring differences in Canadian adult men and women with Diabetes management: results from the Canadian Community Health Survey

BMC Public Health volume 13, Article number: 1089 (2013) Cite this article

Abstract

Background

Over two million Canadians are known to have diabetes. In addition to the economic burden placed on the healthcare system, the human cost associated with diabetes poses a heavy burden on those living with diabetes. The literature shows that apparent differences exist in diabetes complications and diabetes management between men and women. How self-care management and utilization of health services differ by sex is not clearly understood.

The purpose of this study was to explore sex differences in diabetes self-care and medical management in the Canadian population, using a nationally representative sample.

Methods

Data collected from the cross-sectional, population-based Canadian Community Health Survey (2007–2008) were used in these analyses. A bootstrap variance estimation method and bootstrap weights provided by Statistics Canada were used to calculate 95% confidence intervals. Bivariate analyses identified variables of interest between females and males that were used in subsequent multivariate analyses.

Results

A total of 131,959 respondents were surveyed for the years of 2007 and 2008, inclusive. Fully adjusted multinomial and logistic regression analyses revealed sex differences for those living with diabetes. Compared to men with diabetes, women were more likely to be in the lowest income quintiles than the highest (OR: 1.8, 95% CI: 1.3-2.6) and were more likely not to have a job in the previous week (OR: 1.8, 95% CI: 1.4-2.4). Women were also more likely to avoid foods with fats or high calories (OR: 2.1, 95% CI: 1.4-3.0 and OR: 2.2, 95% CI: 1.6-3.0, respectively), to be concerned about heart disease (OR: 1.6, 95% CI: 1.1-2.2), and to be non-smokers (OR: 2.2, 95% CI: 1.6-3.0). However, despite their increased concern, women checked their blood-glucose less frequently on a daily basis than men (μwomen = 1.7, 95% CI: 1.7-1.8; μmen = 3.1, 95% CI: 2.9-3.2). Women were more likely to have an anxiety disorder (OR: 2.3, 95% CI: 1.7-3.2) and a mood disorder (OR: 2.4, 95% CI: 1.8-3.1), and more likely to be physically inactive (OR: 1.5, 95% CI: 1.2-1.8).

Conclusions

Our findings underscore the importance of addressing sex differences which may interfere with diabetes self-care. In women, addressing socioeconomic and psychological barriers, as well as limitations to active living are important; in men, the benefit of more effective nutrition therapy and smoking cessation interventions are suggested. The results for this study highlight the need to further investigate and eliminate disparities between the sexes in order to optimize health outcomes among Canadians with diabetes.

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Background

In 2008/09, an estimated 2.4 million Canadians (6.8%) were living with diabetes [1]. The number of Canadians with diabetes is expected to increase over the next few years with projections ranging from 2.4 million by 2016 [2] to 2.5 million by 2020 [3]. Along with the enormous economic burden on the Canadian economy, estimated at approximately 16.9 billion dollars [3], the human cost associated with diabetes poses a heavy burden on those living with diabetes. For instance, diabetes-related morbidity may include retinopathy, neuropathy, nephropathy, cerebrovascular, peripheral vascular and cardiovascular diseases, and early mortality [4, 5]. Diabetes also ranks amongst the five leading causes of death by disease in most countries [6]. Approximately 80% of Canadians with diabetes die from a heart attack or stroke [7], and approximately 25% suffer from depression [8]. Life expectancies can be considerably shorter for those living with both Type 1 (up to 15 fewer years) and Type 2 diabetes (5 to 10 fewer years) [7].

A number of studies have looked at differences in diabetes complications and diabetes management among men and women. For examples, studies have shown that the relative risk of cardiovascular disease (CVD), coronary artery disease and stroke is higher among women with diabetes than among men with diabetes [9–15]. Another study showed that women with diabetes may not reach the recommended therapeutic targets for lipid profile, blood pressure (BP) levels and Hemoglobin A1C (A1C), a measure of glycemic control, as a result of less aggressive management of diabetes compared to men with diabetes [16].

The Project for an Ontario Women’s Health Evidence-Based Report (POWER study) examined gender differences on a variety of evidence-based indicators among women and men living with diabetes in Ontario, Canada. This study found that women had worse health and functional status than men, including higher rates of comorbid conditions including heart disease, stroke, high blood pressure, arthritis, cancer and depression. Women used health services more often. Few studies, however, have examined sex differences in diabetes self-care [17].

The purpose of this study was to explore sex differences in diabetes self-care and medical management in the Canadian population. Such differences, if found, may inform health care practice and policy.

Methods

Statistics Canada’s Research Data Centre at the University of Toronto, Ontario provided authors with approved access to the data from the Canadian Community Health Survey (CCHS), 2007–2008. The Survey included Health care determinants and utilization data collected from the Canadian population across 121 health regions was analyzed. A total of 131,959 respondents were surveyed for the years of 2007 and 2008, inclusive. All residents aged 12 and over were eligible for participation, excluding individuals living on Crown Lands, Indian Reserves, institutional-residents, full-time members of the Canadian Forces, and residents of certain remote regions [18]. All responses to questions were self-reported. Survey respondents were classified as having diabetes if they reported that their condition had been diagnosed by a health care professional. Respondents both taking and not taking insulin were collapsed into one category. Pregnant women were excluded from the analyses, and therefore gestational diabetes and women with pre-existing diabetes in pregnancy were not included. Only participants 18 years and older were included in this study.

Statistical analysis

Prevalence estimates representative of the population for each variable were calculated based on survey expansion weights provided within the CCHS dataset. Calculation of 95% confidence intervals (CIs) and coefficients of variation (CV) were determined using a bootstrap variance estimation method and bootstrap weights (provided by Statistics Canada). Proportions were considered significant if their 95% confidence intervals did not overlap, and odds ratios (ORs) were considered significant if their 95% confidence intervals did not include the value of 1.0. Variable estimates were considered of “marginal quality” with a CV between 16.6 and 33.3% due to high sampling variability. Estimates were not reported with a CV greater than 33.3%.

Demographic, clinical, and lifestyle characteristics were calculated for those living with and without diabetes. Multivariate analyses were conducted to explore sex differences in the population with diabetes. Logistic regressions were used to assess the associations between sex and hypertension, heart disease, anxiety disorder, mood disorder, physical activity, activity limitation, fruit and vegetable consumption, food avoidance, and concern about food choice and avoidance. Ordinal logistic regressions were used to assess the association between sex and education, income, marital status, BMI category, smoking status, alcohol consumption, and working status during the previous week. All analyses were conducted using SAS (v 9.2) [19] with bootstrap weights provided by Statistics Canada.

The following covariates were included in the adjusted models: age, education, income, marital status, body mass index (BMI), physical activity level, smoking status, alcohol consumption, fruit and vegetable consumption, and number of consultations with a medical doctor. The covariates were chosen because they were significant at the bivariate level or were considered potential confounders. Calculation of BMI (kg/m2) was based on the World Health Organization (WHO) cut-offs [20], and daily recommended consumption of fruits and vegetables were based on Canada’s Food Guide to Healthy Eating. Testing for A1C was categorized into two variables based on the 2007 or 2008 guidelines [8].

Results

Table 1 presents the weighted distributions of sample demographic characteristics for the population of Canadians living with and without diabetes by sex. In both populations there were significantly more women than men who did not complete high school education, and more men than women who had obtained a post-secondary degree. In general, the lower income quintiles had a higher proportion of women and the higher income quintiles had a higher proportion of men. Regardless of diabetes status, fewer women were married or in common-law relationships and more women were classified as being widowed, separated, or divorced.

Table 1 Demographic characteristics for individuals living with and without diabetes by gender
Full size table

Table 2 presents the clinical and lifestyle characteristics of individuals living with and without diabetes by sex. A higher proportion of women than men with diabetes reported having hypertension (59.3% vs. 50.1%), anxiety disorders (8.3% vs. 3.5%), and mood disorders (13.2% vs. 5.5%). However, no sex differences were observed for those with diabetes with regards to whether they were taking blood pressure medication, and whether they had heart disease, current cancer and previous cancer. Among those without diabetes, more men than women were obese (16.6% vs. 14.4%, respectively); however, among those with diabetes, more women were obese than men (42.8% vs. 37.9%, respectively), though this finding was not statistically significant. Within the population without diabetes, more women than men reported having a regular medical doctor, being an overnight patient in the previous year, and reported visiting an eye specialist (in the past 12 months) more frequently than men (μwomen = 0.6, 95% CI: 0.6-0.6; μmen = 0.4, 95% CI: 0.4-0.4), though this sex difference was not significant in the population with diabetes.

Table 2 Clinical and lifestyle characteristics of individuals living with and without diabetes by gender
Full size table

There were no significant differences between women and men living with diabetes with regards to their initial age of diagnosis, the proportion taking insulin or pills to manage their diabetes, or the timeframe when they began taking insulin (Table 3). Regarding the mean number of times individuals with diabetes self-check their glucose levels on a daily basis, a sex difference was observed for individuals not taking insulin, with women checking less frequently (μwomen = 1.7, 95% CI: 1.7-1.8) than men (μmen = 3.1, 95% CI: 2.9-3.2) [Data not in tables]. Men and women who were taking insulin to manage their diabetes reported checking their blood glucose with a similar daily frequency (μmen = 2.1, 95% CI: 2.0-2.2; μwomen = 2.2, 95% CI: 2.1-2.4) [Data not in tables].

Table 3 Diabetes-specific characteristics for men and women
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Table 4 presents lifestyle characteristics and behaviours for individuals living with and without diabetes by sex. A greater proportion of women than men in both populations experienced participation and activity limitation. More women than men avoided certain foods because they were concerned with fat content or caloric content. As well, a greater proportion of women revealed not having a job in the previous week, while a greater proportion of men had a job and were at work within the previous week. Irrespective of whether they had diabetes, more women chose to avoid certain foods because they were concerned about fat content or caloric content of their food (Table 4).

Table 4 Lifestyle characteristics and behaviours for individuals living with and without diabetes by gender
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No significant differences existed between women and men living with diabetes with regards to the provision of medical management (Table 5).

Table 5 Medical management of diabetes for men and women
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Table 6 summarizes results of the fully adjusted models for sex differences of Canadians with diabetes. Compared to men with diabetes, women were more likely to live in the third or lower income quintile than the highest income bracket, and be divorced/widowed/separated or never married compared to being married/common-law. Women with diabetes were more likely than males to have not had a job in the previous week. They were also more likely to be physically inactive, consume one drink a week or less or be non-drinkers, to meet the recommended daily fruit and vegetable consumption, and to avoid foods with high calories, avoid foods with fat, and select or avoid foods because they were concerned with heart disease. Women were also more likely to have hypertension, but less likely to have heart disease. In addition, women were more likely to have an anxiety and mood disorder than men. Women were also less likely to be considered former smokers and more likely to be non-smokers (Table 6).

Table 6 Odds ratio for variables of interest associated with gender for those living with diabetes
Full size table

Discussion

This study used cross-sectional data to explore sex differences in diabetes care among Canadians representing a current population of over 1.9 million people living with diabetes [21, 22]. Our findings show that women were more likely to report healthy eating behaviours, to be more concerned about heart disease and to face more socioeconomic barriers. More women than men with diabetes suffer from hypertension, anxiety and mood disorders.

Low socioeconomic (SES) status has been associated with an increased prevalence of diabetes and poor health outcomes. The association of low SES and diabetes is noted as significant only for women [23]. Dasgupta and colleagues found that the likelihood of Type 2 diabetes increased monotonically with lower education and income groups of Canadian women [24]. Confirming previous research, our fully-adjusted multivariate models showed that women with diabetes are more likely to be in lower income quintiles and to have attained a lower education level than men. Low SES levels have also been linked to poorer diabetes health outcomes in women, including high blood pressure, large waist circumference, and low levels of high density lipoproteins (HDL), all contributing to a higher CVD risk profile [25]. An analysis of a US cohort showed a two-fold increase in diabetes-related mortality when comparing adults with family incomes below the poverty level to those with the highest incomes [26]. With the higher prevalence and greater morbidity and mortality associated with low SES, the need to address socioeconomic barriers, particularly those of women, must take precedence over simply ensuring the provision of diabetes medical management [23].

Heart disease remains the leading cause of mortality in people with diabetes. Previous research has shown that women with diabetes may be at higher risk for developing cardiovascular disease [27, 28] than men and that mortality from both coronary heart disease [29, 30] and stroke [31] is also higher in women with diabetes than men. While mortality was not assessed, our study did provide further evidence of higher odds of women having hypertension and yet, less likely to have heart disease than men with diabetes, a finding consistent in the literature [32, 33]. Compelling evidence supports the need to improve detection and management of heart disease, manage obesity and other cardiovascular risk factors, and to work to actively engage women with diabetes in healthy lifestyle behavior.

Landmark studies have demonstrated that effective management of diabetes reduces the burden and risk of complications, and have shaped clinical practice guidelines (CPGs) internationally [34, 35]. Such studies have emphasized monitoring of glycated hemoglobin (A1C) in the management of diabetes due to its strong correlation with the relative risk of diabetes-related complications [34, 35]. Another valuable measure is self-monitoring of blood glucose (SMBG) which is used to assess glycemic control and determine a need for a change in therapy and self-management [8]. Our findings show no differences in number of A1C tests and in the frequency of SMBG for men and women on insulin therapy. However, for those not on insulin therapy, women reported monitoring less frequently than men. The Canadian CPGs recommend daily SMBG checks for those on insulin therapy, and individualized recommendations for those on oral antihyperglycemic agents [8]. The use of SMBG is essential for an individual living with diabetes to make effective day-to-day self-management decisions, including those that enable the prevention and management of hypoglycemia [36]. Given SES is a known predictor of lack of adherence to recommended frequency of SMBG [37], the reduced frequency in SMBG seen in the women with diabetes in our study may reflect their inability to cover the cost of SMBG, due to their lower income compared to men. Whether the disparity identified in our study in SMBG frequency for women not on insulin therapy translates to poor diabetes self-management, or to increased health risk to women with diabetes, remains to be seen and warrants further research.

The regular screening for and monitoring of diabetes complications are also key aspects of diabetes care and include, among others, routine foot and eye exams [8]. Foot complications account for 20% of all diabetes-related admissions in the North American [38], and most new cases of legal blindness in people of working age are attributed to diabetic retinopathy [39]. Our findings showed no sex differences in the frequency of foot and eye examinations over a 12-month period. The fact that no significant differences were found between the sexes in A1C monitoring and routine screening for foot and eye complications is encouraging and may be potentially attributable to Canada’s universal, government-funded health care system.

One of the strongest predictors of all-cause mortality in people with diabetes is low physical fitness, a stronger risk factor for mortality than even smoking [40]. Over the last four decades, a dramatic decline in the physical activity level of Canadians has occurred [40]. The benefits of maintaining a physically active lifestyle are well documented in the literature. A fairly recent technical review concluded that moderate to high levels of physical activity and cardiorespiratory fitness are related to reduced morbidity and mortality in both Type 1 and Type 2 diabetes and in both men and women [41]. Our findings show that women were more likely to be physically inactive, and experienced participation restrictions and activity limitations more often than men with diabetes. Engaging women in activities of daily living is essential for successful self-management of diabetes and as the literature shows, can be achieved through regular physical activity and functional activities [42]. Identifying and addressing barriers that women face in maintaining an active lifestyle cannot be underestimated.

Nutrition therapy is a cornerstone of diabetes management. Clinical trials have shown nutrition therapy can reduce A1C from 0.25% to 2.9% [43], quite a substantive reduction compared to the effect of diabetes oral diabetes medications. In general, A1C will decrease by about 0.5 to 1.5% with monotherapy, and up to 2.0% with oral antihyperglycemic agents in type 2 diabetes [8]. Diet, in combination with other components of diabetes self-care, can further improve clinical and metabolic outcomes [8]. A lower fat intake significantly improves serum LDL levels in individuals with diabetes [44]. As well, the consumption of a diet rich in fruits and vegetables, among other health benefits, also lowers LDL and is cardio-protective [45, 46]. Our study suggests that women were more likely to have a healthier food and nutrient profile than men with diabetes. Determining effective strategies to enable men to adopt healthier diets will help to improve clinical outcomes and potentially reduce morbidity and mortality.

Smoking is another lifestyle behavior that has detrimental effects on glucose and lipid metabolism in people with diabetes, known to increase diabetes complications and reduce life expectancy [47, 48]. Our study found that women were more likely to be non-smokers. Interestingly, studies show that smokers with diabetes are less likely to adopt nutrition recommendations and use diabetes resources [49]. Health professionals need to work towards engaging people with diabetes, particularly men, in smoking cessation interventions early in the process of diabetes self-management education.

The prevalence of mental illnesses, particularly depression and anxiety disorders, are higher in people with diabetes than those without diabetes. We found that women with diabetes were more likely to have anxiety and mood disorders compared to men with diabetes. Other studies have found similar results. A meta-analysis investigating the association between clinical depression and diabetes found that the presence of diabetes approximately doubles the odds of depression, with the odds being greater in women than in men [50]. Generalized anxiety disorder also appears to be increased in individuals with Type 1 and Type 2 diabetes found in community studies (14% vs. 3%-4%, respectively) [51], with women suffering from a greater degree of severity compared to men (55.3% vs. 32.9%, P < .0001). The impact of these disorders adversely affects self-care behaviours, glycemic control, quality of life, and diabetes complications [50–52]. The Canadian Clinical Practice Guidelines recommend that individuals with diabetes be regularly screened for subclinical psychological distress and psychiatric disorders such as depressive and anxiety disorders and subsequently referred to mental health professionals for treatment [8]. Our findings provide evidence to support the need to implement these recommendations into clinical practice with heightened awareness of the higher odds that women face.

In summary, this study identifies sex differences in a representative sample of the Canadian population living with diabetes; nonetheless, it has some limitations. Data was self-reported and subject to recall bias. Participation in the study was voluntary. While a variety of questions relating to the respondent’s general health and lifestyle were included in the survey, there were relatively few questions that specifically addressed diabetes self-care activities and diabetes care services. The survey did not specify type of diabetes and hence, does not allow insight into sex differences between those with type 1 and type 2 diabetes. Lastly, the CCHS does not survey those living on aboriginal reserves or in institutions across Canada which may represent segments of the population who may be at greater risk of diabetes complications or have infrequent access to health care services.

Conclusion

This study revealed important sex differences in socioeconomic, health, and lifestyle characteristics for Canadians living with diabetes. Our findings support the need for further research to identify the factors affecting the socioeconomic status of women, their barriers to leading more physically active lives, and to monitoring blood sugars. Screening women for subclinical psychological distress and psychiatric disorders such as mood and anxiety disorders and referring those at risk to mental health professionals for intervention should be standard components of clinical practice. Our study also highlights the need for health care professionals to work with men with diabetes, particularly with those who smoke to initiate smoking cessation early in the process of diabetes self-management education, and to assist them in adopting healthier diets. Our findings support health policy change, and strategies to enable more effective diabetes self-management for both men and women. Finally, our findings underscore the importance of further exploring and eliminating disparities amongst the sexes in order to achieve optimal health outcomes among Canadians with diabetes.

Author’s contributions

Study design and concept: EG and MDM. Research proposal: EG and MDM. Statistical analyses: EdS. Interpretation of results: EdS, EG, and MDM. Drafting of manuscript: EdS and MDM. All authors read and approved the final manuscript.

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Acknowledgements

We would like to express our gratitude to the Banting and Best Diabetes Care Centre for the Pilot Grant for Innovative Activities Related to Diabetes Education, Management and Care, to the Toronto Research Data Centre and Statistics Canada for their assistance with the datasets used in our analyses, and to the reviewers for their constructive feedback.

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Authors and Affiliations

  1. SunLife Financial Banting and Best Diabetes Clinic, Toronto Western Hospital, University Health Network, Toronto, Canada

    Margaret De Melo

  2. University Health Network, Toronto, Canada

    Eric de Sa

  3. School of Nutrition, Ryerson University, 350 Victoria Street, Toronto, Ontario, M5B 2 K3, Canada

    Enza Gucciardi

Authors
  1. Margaret De Melo
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  2. Eric de Sa
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  3. Enza Gucciardi
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Corresponding author

Correspondence to Margaret De Melo.

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Competing interests

This study was funded by the Pilot Grant for Innovative Activities Related to Diabetes Education, Management, and Care, Banting and Best Diabetes Centre, Faculty of Medicine, the University of Toronto. The authors declare no competing interests.

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De Melo, M., de Sa, E. & Gucciardi, E. Exploring differences in Canadian adult men and women with Diabetes management: results from the Canadian Community Health Survey. BMC Public Health 13, 1089 (2013). https://doi.org/10.1186/1471-2458-13-1089

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Keywords

  • Diabetes
  • Sex
  • Self-care medical management
  • Health behaviours
  • Canadian community health survey

BMC Public Health

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