Abstract
In double blind tests, the results are usually expressed qualitively by physician's judgements. In order to express those results quantitatively and to avoid the personal deviation between physicians, the rate coefficient “b” is proposed under the assumption of exponential transition of clinical measurements, e. g., GOT, GPT, and etc. It is confirmed that “b” is distributed normally and its standard deviations are the same in tiopronin-group and placebo-group.Using “b”, tiopronin is judged significantly useful for outpatients, but not so useful for inpatients and the method for usefulness-judgement of drugs on Chronic Aggressive Hepatitis are proposed. These methods are checked by the data of previous double-blind test and its validity is recognized.