Sources of heterogeneity were explored through subgroup meta-analyses and meta-regression.

另外，运用分组荟萃分析和元回归分析探讨异质性的根源。

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There was evidence of publication bias and stratified analysis and meta-regression showed outcomes were influenced by study design, age, gender and smoking.

出版有偏见和分层分析和元的证据表明，回归是由研究设计，年龄，性别和吸烟影响的结果。

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Random-effects model meta-regression analyses were performed to assess sources of intertrial heterogeneity.

进行随机效果模型统合回归分析以评估试验间异质性的来源。

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