对简单随机不放回抽样，在总体非敏感属性个体比例未知的情况下，给出了两个子样本容量的最优配置。
Under simple random sampling scheme without replacement and unknown proportion of population possessing neutral attribute, the optimal allocation of sizes of two sub-samples is given.
方法：采用目的性抽样和方便抽样，对广东、江苏、陕西、甘肃、北京等省市共9所公立医院12名妇产科医务人员展开半结构式个体深入访谈或集体访谈。
Methods:An in-depth, semi-structured interview or focus group interview with 12 health workers in Gynecology and Obstetrics Department of 9 public hospitals was conducted.
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