Levels of screening tests were studied by one hour values of GTT on diabetes melitus. The results were as follows:1) Mean blood sugar values of both males and females were increased by aging, and the value for females was slightly higher than for males in all age groups.2) The frequency distributions of the values of GTT showed normal distribution types for both sex and age.3) When the sujbects were screened uniformly by the value of 220 mg/dl of blood sugar, 4.2% of the 5961 males were selected for detailed examination. However, when considering the age factor, subjects were screened by M + 2 SD values, 2.5% were selected for detailed examination.4) We tried similar tests on workers in a certain company. In this test, the value of 170 mg/dl blood sugar was used, and 34.5% of 339 males were selected for detailed examination. But when the subjects were screened by M + 1 SD values of blood sugar, and when those values were corrected for age class, 26.5% were selected for detailed examination. The fre quency of abnormality detected with the M + 1 SD method was 8% less than with the uni form method.5) We checked the efficacy of this method by evaluating laboratory tests. The method that corrected blood sugar value by M + 1 SD, within age classes, was slightly inferior to the uniform method in sensitivity score, but was superior in specificity score. From these results, we determined the M + 1 SD method to be suitable as a screening method for diabetes melitus.
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