偏倚的类型主要包括文献发表性偏倚、文献查寻偏倚和文献筛选偏倚，其中最难克服的是文献发表性偏倚。
The type of bias mainly includes publication bias, literature retrieval bias and literature inclusion bias, amo ng which the publication bias is the hardest overcome.
异质性评价研究利用Q统计评估和发表偏倚采用漏斗图和埃格检验评估。
Study heterogeneity was evaluated using Q statistics and I and publication bias assessed with funnel plots and Egger's test.
入选研究无明显的发表偏倚，但经同质性检验存在明显的异质性。
No significant publication bias was found and significant heterogeneity between these studies was observed.
存在发表性偏倚。
存在发表性偏倚。
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