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多中心临床试验中中心校正的统计学实现(SPSS)

2013-11-19 MedSci MedSci原创

多中心临床试验可以在较短的时间内招募到足够多的病例数,同时,来自多中心的病例比来自单中心的病例更具有代表性,可以使所得结论的应用面更广泛。但由于各中心的试验条件不完全相同,所得结论也不尽相同。因此, 在评价疗效时, 必须考虑中心间效应的差别。当中心间差距较大时,如果直接合并各中心资料,可能会对总的结论有一定影响。这里涉及到两个问题,其一是评价中心效应是否存在,其二是如何扣除中心效应的影响对疗效进行

多中心临床试验可以在较短的时间内招募到足够多的病例数,同时,来自多中心的病例比来自单中心的病例更具有代表性,可以使所得结论的应用面更广泛。但由于各中心的试验条件不完全相同,所得结论也不尽相同。因此,在评价疗效时, 必须考虑中心间效应的差别。当中心间差距较大时,如果直接合并各中心资料,可能会对总的结论有一定影响。 这里涉及到两个问题,其一是评价中心效应是否存在,其二是如何扣除中心效应的影响对疗效进行比较。目前,评价有效率的中心间差别,常用Breslow-Day 检验;而消除中心间的差异对疗效的影响,常采用CMH (Corchran-Mental-Haenszel) 方法 。本文简单介绍有效率的中心间差别的Breslow-Day 检验,以及扣除中心效应的CMH 方法;并进一步讨论logistic 回归模型在对中心效应进行评价和修正中的应用。 一、 用CMH方法进行统计分析 SPSS中只能进行多中心2x2格式的CMH检验(即组别为2个,疗效指标为2分类变量)。分析时,可通过描述性分析-列联表分析。将中心变量选入分层变量栏中,并在Statistic栏中选中卡方分析和Cochrans &nb

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    2024-12-21 ms8000001014740363 来自北京

    说的太简略了

    0

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    2014-07-26 saharadonkey

    题目很吸引人,内容完全是...额.....跟没说一样,方法大家都知道,你倒是举个栗子分析一下啊

    0

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    2014-07-26 superDrZhang

    好,学习了

    0

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    2013-11-21 siiner
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