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  • Title: [Prevalence of newly diagnosed type 2 diabetes, impaired glucose tolerance and abnormal fasting glucose in a high risk population. Data from the RIAD study using new diagnostic criteria for diabetes].
    Author: Köhler C, Temelkova-Kurktschiev T, Schaper F, Fücker K, Hanefeld M.
    Journal: Dtsch Med Wochenschr; 1999 Sep 17; 124(37):1057-61. PubMed ID: 10520305.
    Abstract:
    BACKGROUND AND OBJECTIVE: In 1997 the American Diabetes Association (ADA) introduced new criteria for the diagnosis of type 2 diabetes mellitus, reducing the upper limit of normal fasting blood sugar from 140 to 126 mg/dl. A level of between 110 and 126 < mg/dl (6.1-7.0 mmol/l) was added as a new category, "impaired fasting glucose" (IFG) as an at-risk factor. It was the aim of this study to determine what effect these new criteria will have on the prevalence of type 2 diabetes and other glucose tolerance stages in the German population. PATIENTS AND METHODS: The analysis was based on data collected in the "Risk-factors in IGT for atherosclerosis and diabetes" (RIAD) study. 1139 persons of an at-risk population group (aged 40-70 years) were investigated. Most of them were relatives of diabetics and/or themselves had obesity and/or dyslipidaemia. All known diabetics were excluded. All subjects underwent an oral glucose test with 75 g glucose, and plasma glucose values were used for classifying them into different glucose tolerance stages. RESULTS: According to the new ADA criteria, confirmed by WHO in 1998, the prevalence of type 2 diabetes mellitus was shifted from 11% to 15.1%, that of IGT from 28.8% to 26.2%. An impaired fasting glucose was found in 27.1% of the population cohort, 9.2% of whom had 2-hour plasma glucose levels corresponding to the diabetes criteria. Men in the first age decade (40-49 years) had a 14% prevalence of previously undetected type 2 diabetes, double that in women. Hyperlipidaemia, hypertension and obesity were significantly more common in diabetics and persons with IGT than in normoglycaemic persons. CONCLUSIONS: The prevalence of previously unknown type 2 diabetes is very high in this at-risk part of the population. Using the criteria for impaired fasting glucose, 9.2% diabetics would remain undetected. We, therefore, support the recommendation that an oral glucose tolerance test be performed in those of the population aged over 45 years and in younger at-risk persons so that any indicated treatment can be initiated at the earliest. Measurement of fasting glucose is adequate in the population aged under 45 years not at special risk.
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