此外，这些部门缺乏对血片的显微分析，引进了许多混杂疾病的效应。
In addition, the lack of microscopic analyses of blood slides in these units introduces the effects of many confounding diseases.
疗效评价要注重结果的亚组分析，籍此可以寻求和确定干预措施的效应点，充分利用研究数据信息，剔除研究因素中的混杂因素。
Pay attention to results subgroup analysis in assessment of efficacy, seek and determine the effect point of intervention measures, make full use of data information and eliminate confounding factors.
标准化的本质就是控制混杂效应。
The essence of standardization is the control of confounding effects.
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