Medical records of newly diagnosed non-insulin-dependent diabetic patients attending a Diabetic Centre in Modena, northern Italy, during the period 1985-88 were reviewed to analyze the prevalence of hypertension at age of diagnosis of diabetes and its association with selected risk factors. The prevalence of hypertension was also determined in a representative sample of control subjects. In the multivariate analysis, greater body mass index and older age, but not smoking, were strongly associated with increased rates of hypertension both in control and in diabetic subjects. In diabetic patients, family history of diabetes, defined as presence of diabetes in close relatives, was not significantly associated with hypertension, while rates of hypertension were significantly lower in patients who reported at least one parent affected by diabetes. After adjustment for age and body mass index, newly diagnosed non-insulin-dependent diabetes was not an independent risk factor for hypertension. These findings seem to be consistent with the hypothesis that diabetes and hypertension are not linked by a common genetic background.