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结合临床实例，采用Ｙｏｕｎｇ氏双对数线图法（ｎｏｍｏｇｒａｍｓ），确定其研究样本含量的充足性以便客观地分析临床研究的阴性结果。Ｙｏｕｎｇ氏双对数线图法简便、实用、易于掌握
Combined with clinical examples, Young’s bi-nomograms were used to determine the adequacy of the sample size in order to objectively analyze the negative results of clinical studies. Young’s double logarithmic graph method is simple, practical and easy to master