Paired versus two-group experimental design for rheological studies of vocal fold tissues.

Paired versus two-group experimental design for rheological studies of vocal fold tissues.
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声带组织流变学研究的配对与两组实验设计。

DOI:
10.1016/j.jbiomech.2018.11.040
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发表时间:
2019
影响因子:
2.4
通讯作者:
Zhang,Song
Zhang,Song
中科院分区:
工程技术3区
文献类型:
--
作者:
Xu,ChetC;Li,Dateng;Mau,Ted;McPherson,Elhum;Du,Mindy;Zhang,Song

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声带的振动功能在很大程度上取决于声带固有层的流变特性或粘弹性剪切特性。迄今为止,声带流变学研究的样本量估计和统计实验设计的调查是不存在的。本文给出了声带研究中两种主要研究设计(配对和两组设计)的封闭样本量公式。我们的结果表明,配对设计可以大大提高统计功效相比,两组设计。通过比较估计治疗效果的方差,本研究还证实,在流变学数据分析过程中忽略受试者内和声带内相关性可能会增加I型错误。最后,完整的和疤痕的兔声带固有层的粘弹性剪切性能进行了测量,并用于说明理论研究结果在现实的情况下,项目样本量的要求,为未来的研究。
Vibratory function of the vocal folds is largely determined by the rheological properties or viscoelastic shear properties of the vocal fold lamina propria. To date, investigation of the sample size estimation and statistical experimental design for vocal fold rheological studies is nonexistent. The current work provides the closed-form sample size formulas for two major study designs (i.e. paired and two-group designs) in vocal fold research. Our results demonstrated that the paired design could greatly increase the statistical power compared to the two-group design. By comparing the variance of estimated treatment effect, this study also confirms that ignoring within-subject and within-vocal fold correlations during rheological data analysis will likely increase type I errors. Finally, viscoelastic shear properties of intact and scarred rabbit vocal fold lamina propria were measured and used to illustrate theoretical findings in a realistic scenario and project sample size requirement for future studies.
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