目的比较简单随机化、中心分层区组随机化和最小化法的均衡性。
Objective To compare the balance of simple randomization, stratified blocked randomization and minimization.
方法1、将符合纳入标准的80例患者采用简单随机化的分组方法将参加实验的对象随机分成两组，每组40例。
Methods1. To conform to the standards in 80 patients using simple random method, were randomly divided into a and B, 40 cases in each group.
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