Original ArticlesLow Prevalence of Long-Term Complications in Non–Insulin-Dependent Diabetes Mellitus in France: A Multicenter Study
Introduction
The risk (and costs) linked with diabetes mellitus lies essentially in its long-term complications (retinopathy, nephropathy, neuropathy, and cardiovascular diseases). Non–insulindependent diabetic (NIDDM) patients have been shown to experience an important excess of cardiovascular mortality.[1]Moreover, NIDDM patients represent an important proportion of the cases of endstage renal disease2 and blindness,3, 4and they experience lower-limb amputation up to ten times more often than nondiabetic subjects,[5]because of the joint effects of neuropathy and peripheral vascular disease. Thus, NIDDM is an important issue in Public Health.
The CODIAB study is the first study in France assessing the prevalence rates of complications in a multicenter sample of NIDDM patients, with standardization of the diagnosis of complications.
Section snippets
Study Sample
Seven departments of internal medicine in regional hospitals, one University center in Paris and two private diabetologists participated in the study. Between April 1989 and May 1992, 540 diabetic outpatients, consulting regularly in the centers, were recruited. Inclusion criteria for NIDDM patients were (1) age 35–74 years, (2) duration of diabetes greater than 1 year, and (3) treatment with diet and/or oral antidiabetic drugs and/or secondarily with insulin (at least 2 years after the
Results
The characteristics of the CODIAB sample are shown in Table 2; it included 200 women and 227 men, i.e., 53% of men. As could be awaited for type II diabetic patients, they had been diagnosed in middle age (mean age at diagnosis, 46 years), were treated mostly by oral antidiabetic agents and were overweight: 56% of men and 77% of women were obese (BMI greater than 27 kg/m2 in men and 25 kg/m2 in women). Finally, glycemic control was not satisfactory: 54% of the patients had a fasting blood
Prevalence of Complications
The prevalence rates of the different complications in our study were among the lowest found in the literature. It is necessary to examine whether methodological flaws might have produced an underestimation of the prevalences. First of all, the analysis of the characteristics of our patients shows that this can hardly be due to our sampling methods. As no diabetes registry exists in France, our concern was to constitute a sample of diabetic patients as representative as possible. The
Conclusion
In conclusion, our study suggests that the French population may be protected against the most severe forms of NIDDM; insulin therapy is less frequently required than in the United States and in Northern Europe, and correspondingly, prevalence of retinopathy and nephropathy are lower. Cardiovascular diseases may also be less prevalent, like in the general French population.
Acknowledgements
This study was financially supported by ZENECA PHARMA-France. This study was supported by the Société de Secours des Amis de la Science.
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