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Sample Size in Qualitative Interview Studies: Guided by Information Power

Malterud, Kirsti ; Siersma, Volkert Dirk ; Guassora, Ann Dorrit

Qualitative health research, 2016-11, Vol.26 (13), p.1753-1760 [Periódico revisado por pares]

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Título:
Sample Size in Qualitative Interview Studies: Guided by Information Power
Autor: Malterud, Kirsti ; Siersma, Volkert Dirk ; Guassora, Ann Dorrit
É parte de: Qualitative health research, 2016-11, Vol.26 (13), p.1753-1760
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: Sample sizes must be ascertained in qualitative studies like in quantitative studies but not by the same means. The prevailing concept for sample size in qualitative studies is “saturation.” Saturation is closely tied to a specific methodology, and the term is inconsistently applied. We propose the concept “information power” to guide adequate sample size for qualitative studies. Information power indicates that the more information the sample holds, relevant for the actual study, the lower amount of participants is needed. We suggest that the size of a sample with sufficient information power depends on (a) the aim of the study, (b) sample specificity, (c) use of established theory, (d) quality of dialogue, and (e) analysis strategy. We present a model where these elements of information and their relevant dimensions are related to information power. Application of this model in the planning and during data collection of a qualitative study is discussed.
Editor: Los Angeles, CA: SAGE Publications
Idioma: Inglês

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