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1 3 研究设计类型1 3 1 随机对照试验 (ＲＣＴ) 又称随机同期对照试验 ,主要用于研究治疗及预防效果。在治疗研究时 ,首先要根据为获得其临床疗效差别并具有临床意义的最低要求样本数而作出样本的估计数。将符合诊断标准、纳入标准和不属于排除的对象 ,自愿或同意 (或家长同
1 3 Study Design Types 1 3 1 Randomized Controlled Trials (RCTs) Also known as randomized controlled trials of the same period, they are mainly used to study the effects of treatment and prevention. At the time of the treatment study, an estimate of the sample should be based on the minimum number of samples required to obtain a difference in clinical efficacy and clinical significance. Will meet the diagnostic criteria, inclusion criteria and exclusions, voluntary or consent (or parental