Prevalence of chronic complications of type 2 diabetes mellitus in outpatients - a cross-sectional hospital based survey in urban China

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Abstract

Background

Chronic complications are the major outcome of type 2 diabetes mellitus progress, which reduce the quality of life of patients, incur heavy burdens to the health care system, and increase diabetic mortality. The aims of this study were to describe the prevalence of chronic complications among urban Chinese type 2 diabetic outpatients; and to analyze the associations between chronic complications and patients' demographics, diabetic related clinical characteristics.

Methods

This cross-sectional hospital-based study was carried out in 4 major Chinese cities: - Shanghai, Chengdu, Beijing and Guangzhou. The survey was conducted from March to July in 2007 among 1,524 type 2 diabetic outpatients. The subjects were interviewed face-to-face by trained interviewers using a questionnaire to capture information on demographics, disease presentations and complications. All the subjects were invited to have a HbA1c test free of charge by the standardized method with Bio-Rad Variant II.

Results

Of the 1,524 study subjects, 637 (41.8%) were male, and the mean age was 63.3 ± 10.2 years. At least one chronic complication was diagnosed in 792 individuals (52.0%) of the study subjects; 509 (33.4%) presented with macrovascular complications and 528 (34.7%) with microvascular complications. The prevalence of cardiovascular and cerebrovascular conditions, neuropathy, nephropathy, ocular lesions and foot disease were 30.1%, 6.8%, 17.8%, 10.7%, 14.8% and 0.8%, respectively. The prevalence of chronic complications varied between cities, and significantly increased with age and duration of diagnosed diabetes. The mean of HbA1c in diabetic patients with chronic complications was 8.2% ± 1.6% and 63.0% of the subjects with type 2 diabetes related complications had a poor glycemic control with the HbA1c > 7.5%.

Conclusions

Chronic complications are highly prevalent among type 2 diabetic outpatients, the glycemic control of diabetic patients with chronic complications was poor, and future efforts should be directed at intensive blood glucose control, strengthening early diagnosis and improving case management to prevent and minimize the occurrence of complications.

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Most cited references 18

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Economic costs of diabetes in the U.S. In 2007.

(2008)

The prevalence of diabetes continues to grow, with the number of people in the U.S. with diagnosed diabetes now reaching 17.5 million. The objectives of this study are to quantify the economic burden of diabetes caused by increased health resource use and lost productivity, and to provide a detailed breakdown of the costs attributed to diabetes. This study uses a prevalence-based approach that combines the demographics of the population in 2007 with diabetes prevalence rates and other epidemiological data, health care costs, and economic data into a Cost of Diabetes Model. Health resource use and associated medical costs are analyzed by age, sex, type of medical condition, and health resource category. Data sources include national surveys and claims databases, as well as a proprietary database that contains annual medical claims for 16.3 million people in 2006. The total estimated cost of diabetes in 2007 is $174 billion, including $116 billion in excess medical expenditures and $58 billion in reduced national productivity. Medical costs attributed to diabetes include $27 billion for care to directly treat diabetes, $58 billion to treat the portion of diabetes-related chronic complications that are attributed to diabetes, and $31 billon in excess general medical costs. The largest components of medical expenditures attributed to diabetes are hospital inpatient care (50% of total cost), diabetes medication and supplies (12%), retail prescriptions to treat complications of diabetes (11%), and physician office visits (9%). People with diagnosed diabetes incur average expenditures of $11,744 per year, of which $6,649 is attributed to diabetes. People with diagnosed diabetes, on average, have medical expenditures that are approximately 2.3 times higher than what expenditures would be in the absence of diabetes. For the cost categories analyzed, approximately $1 in $5 health care dollars in the U.S. is spent caring for someone with diagnosed diabetes, while approximately $1 in $10 health care dollars is attributed to diabetes. Indirect costs include increased absenteeism ($2.6 billion) and reduced productivity while at work ($20.0 billion) for the employed population, reduced productivity for those not in the labor force ($0.8 billion), unemployment from disease-related disability ($7.9 billion), and lost productive capacity due to early mortality ($26.9 billion). The actual national burden of diabetes is likely to exceed the $174 billion estimate because it omits the social cost of intangibles such as pain and suffering, care provided by nonpaid caregivers, excess medical costs associated with undiagnosed diabetes, and diabetes-attributed costs for health care expenditures categories omitted from this study. Omitted from this analysis are expenditure categories such as health care system administrative costs, over-the-counter medications, clinician training programs, and research and infrastructure development. The burden of diabetes is imposed on all sectors of society-higher insurance premiums paid by employees and employers, reduced earnings through productivity loss, and reduced overall quality of life for people with diabetes and their families and friends.

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Health-related quality of life in diabetes: The associations of complications with EQ-5D scores

Oddvar Solli, Knut Stavem, IS Kristiansen (2010)

Background The aim of this study was to describe how diabetes complications influence the health-related quality of life of individuals with diabetes using the individual EQ-5D dimensions and the EQ-5D index. Methods We mailed a questionnaire to 1,000 individuals with diabetes type 1 and 2 in Norway. The questionnaire had questions about socio-demographic characteristics, use of health care, diabetes complications and finally the EQ-5D descriptive system. Logistic regressions were used to explore determinants of responses in the EQ-5D dimensions, and robust linear regression was used to explore determinants of the EQ-5D index. Results In multivariate analyses the strongest determinants of reduced MOBILITY were neuropathy and ischemic heart disease. In the ANXIETY/DEPRESSION dimension of the EQ-5D, "fear of hypoglycaemia" was a strong determinant. For those without complications, the EQ-5D index was 0.90 (type 1 diabetes) and 0.85 (type 2 diabetes). For those with complications, the EQ-5D index was 0.68 (type 1 diabetes) and 0.73 (type 2 diabetes). In the linear regression the factors with the greatest negative impact on the EQ-5D index were ischemic heart disease (type 1 diabetes), stroke (both diabetes types), neuropathy (both diabetes types), and fear of hypoglycaemia (type 2 diabetes). Conclusions The EQ-5D dimensions and the EQ-5D seem capable of capturing the consequences of diabetes-related complications, and such complications may have substantial impact on several dimensions of health-related quality of life (HRQoL). The strongest determinants of reduced HRQoL in people with diabetes were ischemic heart disease, stroke and neuropathy.

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A comparison of the health-related quality of life in patients with diabetic foot ulcers, with a diabetes group and a nondiabetes group from the general population.

Lis Ribu, Berit Hanestad, Nils Kåre Birkeland … (2007)

The aim of this study was to describe health-related quality-of-life (HRQL) in patients with diabetic foot ulcers by comparing their HRQL with that of a sample from the general population without diabetes (general population) and a subgroup with diabetes (diabetes population), and to examine the differences between groups by sociodemographic characteristics and lifestyle factors. A cross-sectional study was made of 127 adults with current diabetic foot ulcer, recruited from six hospital outpatient clinics, a control sample categorized as a diabetes population (n = 221) from the Norwegian Survey of Level of Living, and a sample from the general population (n = 5903). Data on sociodemographic characteristics (sex, age, cohabitation, education and employment) and lifestyle (body mass index [BMI] and smoking status) and HRQL (SF-36) were obtained. In all the SF-36 subscales and in the two SF-36 summary scales, the patients with diabetic foot ulcer reported significantly poorer HRQL than the diabetes population. The most striking differences were for role limitation-physical (32.1 vs. 62.2, p < 0.001), physical functioning (57.5 vs. 77.3, p < 0.001) and role limitation-emotional (57.4 vs. 72.0, p < 0.001). The patients with foot ulcer had significantly lower HRQL than the general population on all scales, and in particular on role limitation-physical (32.1 vs. 74.3, p < 0.001), physical functioning (57.5 vs. 85.2, p < 0.001) and general health (50.1 vs. 74.3, p < 0.001). The most important sociodemographic characteristic that differed between the diabetic foot ulcer patients and the diabetes population was that significantly more of the foot ulcer patients were men living alone. The largest differences between the foot ulcer patients and the general population were that more of the foot ulcer patients were men, older, living alone, less well educated, and not working. The diabetic foot ulcer patients, the diabetes population and the general population differed in BMI: 28 kg/m(2) in the foot ulcer patients, 27 kg/m(2) in the diabetes population and 25 kg/m(2) in the general population. Diabetic foot ulcer patients had much worse HRQL compared with the diabetes population and the general population, especially in physical health. Foot ulcer patients were more often men living alone, and obesity was a problem in both the foot ulcer patients and the diabetes population.

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Author and article information

Journal

Journal ID (nlm-ta): Health Qual Life Outcomes

Title: Health and Quality of Life Outcomes

Publisher: BioMed Central

ISSN (Electronic): 1477-7525

Publication date Collection: 2010

Publication date (Electronic): 26 June 2010

Volume: 8

Page: 62

Affiliations

[1 ]Department of Epidemiology, School of Public Health, Fudan University, Shanghai 200032, PR China

[2 ]Centre for Evidence-based Medicine, Beijing University of Chinese Medicine, Beijing 100029, PR China

Article

Publisher ID: 1477-7525-8-62

DOI: 10.1186/1477-7525-8-62

PMC ID: 2906445

PubMed ID: 20579389

SO-VID: 459229e0-2729-4637-a81f-b560a385b723

License:

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.

Prevalence of chronic complications of type 2 diabetes mellitus in outpatients - a cross-sectional hospital based survey in urban China

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Most cited references 18

Economic costs of diabetes in the U.S. In 2007.

Health-related quality of life in diabetes: The associations of complications with EQ-5D scores

A comparison of the health-related quality of life in patients with diabetic foot ulcers, with a diabetes group and a nondiabetes group from the general population.

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