Confidence intervals and sample size calculations to compare variant frequencies.

Confidence intervals and sample size calculations to compare variant frequencies.
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用于比较不同频率的置信区间和样本量计算。

DOI:
10.1002/em.2860070807
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发表时间:
1985
期刊:
Environmental mutagenesis
影响因子:
--
通讯作者:
Albertini,RJ
Albertini,RJ
中科院分区:
--
文献类型:
--
作者:
Sylwester,D;Albertini,RJ

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参考文献

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直接致突变性测试提供了监测人群以检测体内发生遗传损伤的证据的机会。因此,这些测试有可能将早期接触诱变剂与随后的健康影响联系起来。其中一项测试可检测人外周血中体内产生的突变 T 淋巴细胞。对观察到的值(变异频率 (Vf))进行统计分析是本文的主题。我们提出并说明了寻找单个变异频率和两个独立变异频率之比的置信区间的过程。我们还推导了所需样本量的公式,以确保有足够的能力来检测单个变体频率的指定变化或两个变体频率之间的指定差异。我们的方法是利用泊松分布变量的自然对数的近似正态性。即使对于变异频率测定中经常观察到的小值(5-15),所开发的程序似乎也相当准确。此外,该程序非常易于使用,并且对于参与直接致突变性测试的研究人员来说应该是有价值的。
Direct mutagenicity tests offer the opportunity of monitoring human populations to detect evidence of genetic damage that occurs in vivo. As such these tests offer the potential of linking earlier exposures to mutagenic agents to subsequent health effects. One such test detects mutant T‐lymphocytes that arise in vivo in human peripheral blood. Statistical analysis of the value observed, the variant frequency (Vf), is the subject of this paper. We present and illustrate procedures for finding confidence intervals for a single variant frequency and for the ratio of two independent variant frequencies. We also derive formulae for required sample size to ensure adequate power to detect a specified change in a single variant frequency or a specified difference between two variant frequencies. Our approach is to exploit the approximate normality of the natural logarithm of a Poisson distributed variable. The procedures developed appear to be quite accurate even for the small (5–15) values often observed in the variant frequency assay. Moreover, the procedures are very easy to use and should prove valuable to investigators involved in direct mutagenicity testing.
DOI: 10.1126/science.155.3770.1682
发表时间: 1967-01-01
期刊: SCIENCE
影响因子: 56.9
作者:
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通讯作者: KELLEY, WN
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DOI: --
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影响因子: --
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