Prevalence of diabetes mellitus detected by 75g GTT in Tokyo

Oral glucose tolerance test (75 g GTT) was performed on 5,172 subjects who received physical checkups at Daiichi Survey Center from April 1981 to March 1982 and the Prevalence of diabetes in Tokyo was studied using the new diagnostic criteria of WHO (1980). The diabetic test was obtained in 3.6% of the subjects over 30 years old. Diabetic retinopathy was found in 4.3% of the diabetic cases. The prevalence of diabetes increased with fasting blood glucose (FBG) and it was considered to be adequate to set the screening point for diabetes mellitus by FBG at 100 mg/dl. 50 g GTT and 75 g were performed in 10,456 cases and 11,925 cases, respectively, and mean 1-hour and 2-hour values were compared by FBG levels. The results show that 2-hour values in 50 g GTT which correspond those of 120 mg/dl and 180 mg/dl in 75 g GTT may be 105 mg/dl and 150 mg/dl, respectively. However it is not reasonable to make the conversion by adding a certain value, because the differences varies markedly with each case.