系统评价控制偏倚的方法

Bias Control of Systematic Reviews

系统评价与传统综述的最大区别在于其质量不同 ,即在于其减少偏倚的程度不同。一般而言 ,偏倚的来源主要包括以下方面 :文献检索过程、研究选择过程和数据提取过程产生的偏倚以及所选择的各个研究内在的偏倚。由于系统评价采取了诸如制订检索策略、进行“倒漏斗”分析、预先确立研究选择的纳入与排除标准以及评估纳入研究的方法学质量等有效措施对可能存在的偏倚进行控制、识别以及描述 。

The most important difference between systematic review and traditional narrative review lies in their respective quality, namely the degree of bias control. Generally speaking, the sources of bias include the process of literature searching, study selection, data extraction and original studies. A systematic review may greatly reduce bias, as it takes effective steps such as developing search strategies, undertaking funnel plot analysis, using established criteria for study selection, and assessment of the methodology quality of studies. All these help to control, identify and, describe the possible bias.