隐蔽分组或分配隐藏（allocation concealment或concealed allocation）最早称为盲法分组（blinded allocation），指分组人员不晓得受试对象的任何情况，避免因各种人为因素影响随机分 组造成选择性偏倚的措施。
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最近一个纳入45名帕金森病患者采用基因治疗的研究已经结束并准备将结果公布，该研究是采用随机分组、在第二阶段采用盲法的多中心临床研究。
A 45-patient randomized blinded phase II multicenter clinical trial using the gene therapy to treat Parkinson's has recently ended and results are being readied for publication.
适当的分组隐匿及遮蔽（盲法）之良好的随机对照试验是需要的。
There is a need for well-conducted RCTs with adequate allocation concealment and masking (blinding).
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