Format

Send to

Choose Destination
Qual Health Res. 2016 Nov;26(13):1753-1760. doi: 10.1177/1049732315617444. Epub 2016 Jul 10.

Sample Size in Qualitative Interview Studies: Guided by Information Power.

Author information

1
1 University of Copenhagen, Copenhagen, Denmark.
2
2 Uni Research Health, Bergen, Norway.
3
3 University of Bergen, Bergen, Norway.

Abstract

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.

KEYWORDS:

information power; methodology; participants; qualitative; sample size; saturation

PMID:
26613970
DOI:
10.1177/1049732315617444

Supplemental Content

Full text links

Icon for Atypon
Loading ...
Support Center