<font color="#32cd32"> 分层随机试验决定一个或多个预后因素,使亚组平均具有相似的进入特征。Stratified randomization decides one or multiple prognostic factors to make subgroups, on average, have similar entry characteristics.</font> 通过检查先前研究的结果,可以准确地确定患者因素。<ref>{{Cite journal|last=Sylvester|first=Richard|date=December 1982|title=Fundamentals of clinical trials|journal=Controlled Clinical Trials|volume=3|issue=4|pages=385–386|doi=10.1016/0197-2456(82)90029-0|issn=0197-2456}}</ref> | <font color="#32cd32"> 分层随机试验决定一个或多个预后因素,使亚组平均具有相似的进入特征。Stratified randomization decides one or multiple prognostic factors to make subgroups, on average, have similar entry characteristics.</font> 通过检查先前研究的结果,可以准确地确定患者因素。<ref>{{Cite journal|last=Sylvester|first=Richard|date=December 1982|title=Fundamentals of clinical trials|journal=Controlled Clinical Trials|volume=3|issue=4|pages=385–386|doi=10.1016/0197-2456(82)90029-0|issn=0197-2456}}</ref> |