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Blood glucose results for 2,601 specimens obtained at multiphasic health examination, divided into three age groups, were analyzed using probability plot paper. Two straight lines could be fitted to each distribution. The assumption was made that the lower lines correspond to "normal-healthy" persons, whereas the upper lines correspond to persons with defective control of blood sugar. It was concluded that the mean of the presumed normal-healthy subgroups rises only a few mg/dl per decade.