In addition, in order to prevent one death from breast cancer among local women aged 40-74 during 8 years of follow-up, the NNI and NNBS for mammographic screening program were 1961 and 1494, respectively.

• 此外,欲通过实施乳腺X线检查筛检方案,要在8年内使当地40-74岁妇女预防1例因乳腺癌所致的死亡,NNI为1961人,NNBS为1494人。