The number of patients with end-stage renal failure (ESRF) who have been newly accepted for dialysis because of diabetic nephropathy (DN) is increasing rapidly in Japan. However it is unknown whether this is due to the increasing prevalence of diabetes or to the increasing incidence of diabetic nephropathy. The aim of the study was to investigate the trends of the prevalence of DN from 1980 to 1995. Consecutive patients who visited the Diabetes Center, TWMU, were randomly recruited in 1980 (n=444), in 1985 (n=552), in 1990 (n=752), and in 1995 (n=645). Among the 4 groups there were no significant differences in % male, age, known duration of diabetes, and % referral. The prevalence of DN increased significantly; 4.3% in 1980, 4.4% in 1985, 7.3% in 1990 and 7.6% in 1995 (χ
2 trend=8.2, p<0.01). The trend was significant in patients with a duration of diabetes of more than 5 years (χ
2 trend=8.7, p<0.01). In conclusion, our data indicated that not only the increasing incidence of diabetes but also the increasing incidence of DN might contribute to the rapidly increasing number of patients with ESRF in Japan.
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