临床医师用某种新药或新疗法作某病的疗效试验时,都要根据作试验的病例数算出治愈率、有效率、无效率等疗效指标。但在临床试验中,由于病例是有限的,故所得的疗效试验结果,对同种病的无限病例疗效来讲还是局限的。用某药治某病3例全部治愈时,不能说某药治某病治愈率是百分之百; When a clinician uses a certain new drug or new therapy to make a curative effect test for a certain disease, he must calculate the curative rate, efficiency, inefficiency, and other efficacy indicators according to the number of cases to be tested. However, in clinical trials, because the cases are limited, the results of the curative effects obtained are limited in terms of the efficacy of the infinite case of the same disease. When a certain medicine cures a disease and all are cured in 3 cases, it cannot be said that the cure rate of a certain drug is 100%;