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Applying a mixed methods design to test saturation for qualitative data in health outcomes research

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  • Fatoumata Fofana
  • Pat Bazeley
  • Antoine Regnault

Abstract

Saturation, a core concept in qualitative research, suggests when data collection might end. It is reached when no new relevant information emerges with additional interviews. The aim of this research was to explore whether a mixed methods design could contribute to the demonstration of saturation. Firstly, saturation was conceptualized mathematically using set theory. Secondly, a conversion mixed design was conducted: a set of codes derived from qualitative interviews were quantitized and analyzed using partial least squares (PLS) regression to document whether saturation was reached. A qualitative study conducted by other researchers prior to this work (i.e. none of the present authors was involved in this study) was used to test saturation using PLS regression. This illustrative qualitative study aimed to investigate the impact of Clostridium difficile infection (CDI) on nurses’ work in the hospital and the results were published elsewhere (Guillemin et al. 2015). Semi-structured interviews were conducted with 12 nurses. Saturation was characterized by the cumulative percentage of variability accounted for by PLS factors. After 12 interviews, this percentage was 51% which suggests that saturation was achieved at least on main themes. Two main themes identifying similarities in the experience of nurses caring for patients with CDI were identified: Organization/Coordination of the working day and Time-consuming work. Although dependent on the coding of qualitative data, PLS regression of quantitized data from qualitative interviews generated useful information for the determination of saturation.

Suggested Citation

  • Fatoumata Fofana & Pat Bazeley & Antoine Regnault, 2020. "Applying a mixed methods design to test saturation for qualitative data in health outcomes research," PLOS ONE, Public Library of Science, vol. 15(6), pages 1-12, June.
    • Handle: RePEc:plo:pone00:0234898
    DOI: 10.1371/journal.pone.0234898
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    References listed on IDEAS

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    1. Frank J van Rijnsoever, 2017. "(I Can’t Get No) Saturation: A simulation and guidelines for sample sizes in qualitative research," PLOS ONE, Public Library of Science, vol. 12(7), pages 1-17, July.
    2. Anthony Onwuegbuzie & Nancy Leech, 2007. "A Call for Qualitative Power Analyses," Quality & Quantity: International Journal of Methodology, Springer, vol. 41(1), pages 105-121, February.
    3. Benjamin Saunders & Julius Sim & Tom Kingstone & Shula Baker & Jackie Waterfield & Bernadette Bartlam & Heather Burroughs & Clare Jinks, 2018. "Saturation in qualitative research: exploring its conceptualization and operationalization," Quality & Quantity: International Journal of Methodology, Springer, vol. 52(4), pages 1893-1907, July.
    4. Karl Sivesind, 1999. "Structured, Qualitative Comparison," Quality & Quantity: International Journal of Methodology, Springer, vol. 33(4), pages 361-380, November.
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    Cited by:

    1. Hennink, Monique & Kaiser, Bonnie N., 2022. "Sample sizes for saturation in qualitative research: A systematic review of empirical tests," Social Science & Medicine, Elsevier, vol. 292(C).

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