The smaller family size is mainly due to the positive results of population control.
家庭户规模缩小，主要是人口控制所产生的积极效果。
Results Actual use of the method for estimating sample size and the relationship between effect factors and sample size were illustrated by a example of case control family study of liver cancer.
结果用实例说明了病例对照家系设计中样本含量估计方法的应用与影响因素和样本含量的关系。
This system has many advantages, such as the simple design, low cost, little size and convenience. It can be widely used in the Infusion Control Room of the hospital and family.
该系统设计简单、成本低廉、外观小巧、使用方法简便，可应用推广于医院输液监控室和家用输液报警等。
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