What Influences Saturation? Estimating Sample Sizes in Focus Group Research
What Influences Saturation? Estimating Sample Sizes in Focus Group Research
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DOI：
10.1177/1049732318821692
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发表时间：
2019-08-01
影响因子：
3.2
通讯作者：
Weber, Mary Beth
中科院分区：
文献类型：
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作者：
Hennink, Monique M.;Kaiser, Bonnie N.;Weber, Mary Beth
饱和度通常用于确定定性研究中的样本量，但对于影响饱和度的因素却很少有指导。我们的目的是在数据收集之前评估饱和度并确定参数来估计焦点小组研究的样本量。我们使用两种方法来评估 10 次焦点小组讨论的数据饱和度。四个焦点小组足以识别一系列新问题（代码饱和），但需要更多小组才能充分理解这些问题（意味着饱和）。群体分层影响意义饱和度，因此每一层都需要一个焦点小组来识别问题；每个层有两个小组可以提供对问题更全面的理解，但每个层有更多的小组几乎没有带来额外的好处。我们确定了影响焦点小组数据饱和度的六个参数：研究目的、代码类型、小组分层、每层的小组数量以及饱和度的类型和程度。
Saturation is commonly used to determine sample sizes in qualitative research, yet there is little guidance on what influences saturation. We aimed to assess saturation and identify parameters to estimate sample sizes for focus group studies in advance of data collection. We used two approaches to assess saturation in data from 10 focus group discussions. Four focus groups were sufficient to identify a range of new issues (code saturation), but more groups were needed to fully understand these issues (meaning saturation). Group stratification influenced meaning saturation, whereby one focus group per stratum was needed to identify issues; two groups per stratum provided a more comprehensive understanding of issues, but more groups per stratum provided little additional benefit. We identify six parameters influencing saturation in focus group data: study purpose, type of codes, group stratification, number of groups per stratum, and type and degree of saturation.