In the case of birds, the sample can be pooled from several birds of the same flock.
对于鸟类，可以从同一鸟群中的几只鸟中采集样品。
Data were pooled across studies, and relative risks for categorical outcomes and weighted mean differences for continuous outcomes, weighted according to study sample size, were calculated.
将所有的研究的数据合成，对于分类变量效应指标为风险比，对于连续型变量效应指标为加权均数差，根据研究样本的大小来加权。
Data were pooled across studies, and relative risks for categorical outcomes and weighted mean differences for continuous outcomes, weighted according to study sample size, were calculated.
将所有的研究的数据合成，对于分类变量效应指标为风险比，对于连续型变量效应指标为加权均数差，根据研究样本的大小来加权。
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