（2）随机分配方案隐藏（concealment of allocation）：由专人确定随机号的 组别并妥善保管分组序列为隐藏充分，用Y表示，发生选择性偏倚的危险性 低；U表示不清楚，指未描述隐藏具体...
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Methodological quality of eligible studies was assessed according to allocation concealment, blinding of intervention, blinding of outcome assessment and completeness of follow up.
合格研究的方法品质是根据分配的隐闭性、实验介入的盲性、结果评估的盲性及后续追踪的完整性来评估的。
There is a high risk of bias for the adequacy of allocation concealment and presence of selective outcome reporting amongst the trials.
这些试验所回报的分组隐匿及筛选结果的表现有很高风险偏差。
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