Saturation in qualitative research: exploring its conceptualization and operationalization

Benjamin Saunders, Julius Sim, Tom Kingstone, Shula Baker, Jackie Waterfield, Bernadette Bartlam, Heather Burroughs, Clare Jinks, Benjamin Saunders, Julius Sim, Tom Kingstone, Shula Baker, Jackie Waterfield, Bernadette Bartlam, Heather Burroughs, Clare Jinks

Abstract

Saturation has attained widespread acceptance as a methodological principle in qualitative research. It is commonly taken to indicate that, on the basis of the data that have been collected or analysed hitherto, further data collection and/or analysis are unnecessary. However, there appears to be uncertainty as to how saturation should be conceptualized, and inconsistencies in its use. In this paper, we look to clarify the nature, purposes and uses of saturation, and in doing so add to theoretical debate on the role of saturation across different methodologies. We identify four distinct approaches to saturation, which differ in terms of the extent to which an inductive or a deductive logic is adopted, and the relative emphasis on data collection, data analysis, and theorizing. We explore the purposes saturation might serve in relation to these different approaches, and the implications for how and when saturation will be sought. In examining these issues, we highlight the uncertain logic underlying saturation-as essentially a predictive statement about the unobserved based on the observed, a judgement that, we argue, results in equivocation, and may in part explain the confusion surrounding its use. We conclude that saturation should be operationalized in a way that is consistent with the research question(s), and the theoretical position and analytic framework adopted, but also that there should be some limit to its scope, so as not to risk saturation losing its coherence and potency if its conceptualization and uses are stretched too widely.

Keywords: Data analysis; Data collection; Grounded theory; Qualitative research; Saturation.

Conflict of interest statement

Compliance with ethical standardsAll authors declare to have no conflicts of interest.

References

    1. Aiken ARA, Dillaway C, Mevs-Korff N. A blessing I can’t afford: factors underlying the paradox of happiness about unintended pregnancy. Soc. Sci. Med. 2015;132:149–155. doi: 10.1016/j.socscimed.2015.03.038.
    1. Birks M, Mills J. Grounded Theory: A Practical Guide. 2. London: Sage; 2015.
    1. Bloor M, Wood F. Keywords in Qualitative Methods: A Vocabulary of Research Concepts. London: Sage; 2006.
    1. Boddy CR. Sample size for qualitative research. Qual. Mark. J. 2016;19(4):426–432. doi: 10.1108/QMR-06-2016-0053.
    1. Bowen GA. Naturalistic inquiry and the saturation concept: a research note. Qual. Res. 2008;8(1):137–152. doi: 10.1177/1468794107085301.
    1. Bryman A. How many qualitative interviews is enough? In: Baker SE, Edwards R, editors. How Many Qualitative Interviews is Enough? Expert Voices and Early Career Reflections on Sampling and Cases in Qualitative Research. Southampton: ESRC National Centre for Research Methods, University of Southampton; 2012. pp. 18–20.
    1. Charmaz K. Grounded theory in the 21st century: applications for advancing social justice studies. In: Denzin NK, Lincoln YS, editors. The Sage Handbook of Qualitative Research. 3. Thousand Oaks: Sage; 2005. pp. 507–535.
    1. Charmaz K. Grounded theory as an emergent method. In: Hesse-Biber S, Leavy P, editors. Handbook of Emergent Methods. New York: Guilford Press; 2008. pp. 155–170.
    1. Charmaz K. Constructing Grounded Theory. 2. Thousand Oaks: Sage; 2014.
    1. Constantinou C, Georgiou M, Perdikogianni M. A comparative method for themes saturation (CoMeTS) in qualitative interviews. Qual. Res. 2017
    1. Damschroder LJ, Pritts JL, Neblo MA, Kalarickal RJ, Creswell JW, Hayward RA. Patients, privacy and trust: patients’ willingness to allow researchers to access their medical records. Soc. Sci. Med. 2007;64(1):223–235. doi: 10.1016/j.socscimed.2006.08.045.
    1. Denny E. “I never know from one day to another how I will feel”: pain and uncertainty in women with endometriosis. Qual. Health Res. 2009;19(7):985–995. doi: 10.1177/1049732309338725.
    1. Dey I. Grounding Grounded Theory: Guidelines for Qualitative Inquiry. San Diego: Academic Press; 1999.
    1. Dey I. Grounding categories. In: Bryant A, Charmaz K, editors. The SAGE Handbook of Grounded Theory. Thousand Oaks: Sage; 2007. pp. 167–190.
    1. Drisko JW. Strengthening qualitative studies and reports. J. Soc. Work Educ. 1997;33(1):185–187. doi: 10.1080/10437797.1997.10778862.
    1. Dubé E, Vivion M, Sauvageau C, Gagneur A, Gagnos R, Guay M. “Nature does things well, why should we interfere?”: vaccine hesitancy among mothers. Qual. Health Res. 2016;26(3):411–425. doi: 10.1177/1049732315573207.
    1. Forsberg A, Bäckman L, Möller A. Experiencing liver transplantation: a phenomenological approach. J. Adv. Nurs. 2000;32(2):327–334. doi: 10.1046/j.1365-2648.2000.01480.x.
    1. France NEM, Farrell K, Kearney B, Myatt S. Women living with fibromyalgia: “do no harm”. Int. J. Hum. Caring. 2008;12(4):21–25.
    1. Francis JJ, Johnston M, Robertson C, Glidewell L, Entwhistle V, Eccles MP, Grimshaw JM. What is an adequate sample size? Operationalising data saturation for theory-driven interview studies. Psychol. Health. 2010;25(10):1229–1245. doi: 10.1080/08870440903194015.
    1. Fusch PI, Ness LR. Are we there yet? Data saturation in qualitative research. Qual. Rep. 2015;20(9):1408–1416.
    1. Ganle JK. Hegemonic masculinity, HIV/AIDS risk perception and sexual behavior change among young people in Ghana. Qual. Health Res. 2016;26(6):763–781. doi: 10.1177/1049732315573204.
    1. Garrett CR, Gask LL, Hays R, Cherrington A, Bundy C, Dickens C, Waheed W, Coventry PA. Accessing primary health care: a meta-ethnography of the experiences of British South Asian patients with diabetes, coronary heart disease or a mental health problem. Chronic Illn. 2012;8(2):135–155. doi: 10.1177/1742395312441631.
    1. Given LM. 100 Questions (and Answers) About Qualitative Research. Thousand Oaks: Sage; 2016.
    1. Glaser BG. Theoretical Sensitivity. Mill Valley: Sociology Press; 1978.
    1. Glaser BG. Emergence vs Forcing: Basics of Grounded Theory Analysis. Mill Valley: Sociology Press; 1992.
    1. Glaser BG, Strauss AL. The Discovery of Grounded Theory: Strategies for Qualitative Research. Chicago: Aldine; 1967.
    1. Grady MP. Qualitative and Action Research: A Practitioner Handbook. Bloomington: Phi Delta Kappa Educational Foundation; 1998.
    1. Goulding C. Grounded theory, ethnography and phenomenology: a comparative analysis of three qualitative strategies for marketing research. Eur. J. Mark. 2005;39(3/4):294–308. doi: 10.1108/03090560510581782.
    1. Guest G, Bunce A, Johnson L. How many interviews are enough? An experiment with data saturation and variability. Field Methods. 2006;18(1):59–82. doi: 10.1177/1525822X05279903.
    1. Hale ED, Treharne GJ, Kitas GD. Qualitative methodologies II: a brief guide to applying interpretative phenomenological analysis in musculoskeletal care. Musculoskelet. Care. 2007;6(2):86–96. doi: 10.1002/msc.113.
    1. Hancock ME, Amankwaa L, Revell MA, Mueller D. Focus group data saturation: a new approach to data analysis. Qual. Rep. 2016;21(11):2124–2130.
    1. Hawkins RL, Abrams C. Disappearing acts: the social networks of formerly homeless individuals with co-occurring disorders. Soc. Sci. Med. 2007;65(10):2031–2042. doi: 10.1016/j.socscimed.2007.06.019.
    1. Hennink MM, Kaiser BN, Marconi VC. Code saturation versus meaning saturation: how many interviews are enough? Qual. Health Res. 2017;27(4):591–608. doi: 10.1177/1049732316665344.
    1. Hill CL, Baird WO, Walters SJ. Quality of life in children and adolescents with osteogenesis imperfecta: a qualitative interview based study. Health Qual. Life Outcomes. 2014;12:54. doi: 10.1186/1477-7525-12-54.
    1. Jackson D, Daly J, Davidson P, Elliott D. Women recovering from first-time myocardial infarction (MI): a feminist qualitative study. J. Adv. Nurs. 2000;32(6):1403–1411. doi: 10.1046/j.1365-2648.2000.01622.x.
    1. Jackson M, Harrison P, Swinburn B, Lawrence M. Using a qualitative vignette to explore a complex public health issue. Qual. Health Res. 2015;25(10):1395–1409. doi: 10.1177/1049732315570119.
    1. Jassim GA, Whitford DL. Understanding the experiences and quality of life issues of Bahraini women with breast cancer. Soc. Sci. Med. 2014;107:189–195. doi: 10.1016/j.socscimed.2014.01.031.
    1. Kazley AS, Johnson E, Simpson K, Chavin K, Baliga P. African American patient knowledge of kidney disease: a qualitative study of those with advanced chronic kidney disease. Chronic Illn. 2015;11(4):245–255. doi: 10.1177/1742395314556658.
    1. Kennedy F, Harcourt D, Rumsey N. The shifting nature of women’s experiences and perceptions of ductal carcinoma in situ. J. Adv. Nurs. 2012;68(4):856–867. doi: 10.1111/j.1365-2648.2011.05788.x.
    1. Legard R, Keegan J, Ward K. In-depth interviews. In: Ritchie J, Lewis J, editors. Qualitative Research Practice: A Guide for Social Science Students and Researchers. London: Sage; 2003. pp. 139–169.
    1. Leininger M. Evaluation criteria and critique of qualitative research studies. In: Morse JM, editor. Critical Issues in Qualitative Research Methods. Thousand Oaks: Sage; 1994. pp. 95–115.
    1. Lipworth W, Taylor N, Braithwaite J. Can the theoretical domains framework account for the implementation of clinical quality interventions? BMC Health Serv. Res. 2013;13:530. doi: 10.1186/1472-6963-13-530.
    1. Long-Sutehall T, Willis H, Palmer R, Ugboma D, Addington-Hall J, Coombs M. Negotiated dying: a grounded theory of how nurses shape withdrawal of treatment in hospital critical care units. Int. J. Nurs. Stud. 2011;48(12):1466–1474. doi: 10.1016/j.ijnurstu.2011.06.003.
    1. Malterud K, Siersma VD, Guassora AD. Sample size in qualitative interview studies: guided by information power. Qual. Health Res. 2016;26(13):1753–1760. doi: 10.1177/1049732315617444.
    1. Marshall V, Long BC. Coping processes as revealed in the stories of mother of children with autism. Qual. Health Res. 2010;20(1):105–116. doi: 10.1177/1049732309348367.
    1. Mason, M.: Sample size and saturation in PhD studies using qualitative interviews. Forum Qual. Health Res. 11(3), art 8 (2010)
    1. McNulty C, Ricketts EJ, Rugman C, Hogan A, Charlett A, Campbell R. On behalf of the CIRT study group: a qualitative study exploring the acceptability of the McNulty–Zelen design for randomised controlled trials evaluating educational interventions. BMC Family Pract. 2015;16:169. doi: 10.1186/s12875-015-0356-0.
    1. Middlemiss T, Lloyd-Williams M, Laird BJ, Fallon MT. Symptom control trials in patients with advanced cancer: a qualitative study. J. Pain Symptom Manag. 2015;50(5):642–649. doi: 10.1016/j.jpainsymman.2015.05.009.
    1. Morse JM. The significance of saturation. Qual. Health Res. 1995;5(2):147–149. doi: 10.1177/104973239500500201.
    1. Morse JM. Data were saturated…. Qual. Health Res. 2015;25(5):587–588. doi: 10.1177/1049732315576699.
    1. Morse JM, Barrett M, Mayan M, Olson K, Spiers J. Verification strategies for establishing reliability and validity in qualitative research. Int. J. Qual. Methods. 2002;1(2):1–19. doi: 10.1177/160940690200100202.
    1. Naegeli AN, Flood E, Tucker J, Devlen J, Edson-Heredia E. The patient experience with fatigue and content validity of a measure to assess fatigue severity: qualitative research in patients with ankylosing spondylitis (AS) Health Qual. Life Outcomes. 2013;11:192. doi: 10.1186/1477-7525-11-192.
    1. Nelson J. Using conceptual depth criteria: addressing the challenge of reaching saturation in qualitative research. Qual. Res. 2016
    1. Niccolai LM, Hansen CE, Credle M, Shapiro ED. Parents’ recall and reflections on experiences related to HPV vaccination for their children. Qual. Health Res. 2016;26(6):842–850. doi: 10.1177/1049732315575712.
    1. Olshansky EF. Generating theory using grounded theory methodology. In: de Chesnay M, editor. Nursing Research Using Grounded Theory: Qualitative Designs and Methods in Nursing. New York: Springer; 2015. pp. 19–28.
    1. O’Reilly M, Parker N. ‘Unsatisfactory saturation’: a critical exploration of the notion of saturated sample sizes in qualitative research. Qual. Res. 2013;13(2):190–197. doi: 10.1177/1468794112446106.
    1. Otmar R, Kotowicz MA, Nicholson GC, Pasco JA. Methodological reflections on using pilot data from fracture patients to develop a qualitative study. BMC Res. Notes. 2011;4:508. doi: 10.1186/1756-0500-4-508.
    1. Poletti T, Balabanova D, Ghazaryan O, Kocharyan H, Hakobyan M, Arakelyan K, Normand C. The desirability and feasibility of scaling up community health insurance in low-income settings—lessons from Armenia. Soc. Sci. Med. 2007;64(3):509–520. doi: 10.1016/j.socscimed.2006.09.005.
    1. Power T, Jackson D, Carter B, Weaver R. Misunderstood as mothers: women’s stories of being hospitalized for illness in the postpartum period. J. Adv. Nurs. 2015;71(2):370–380. doi: 10.1111/jan.12515.
    1. Sandelowski M. Theoretical saturation. In: Given LM, editor. The SAGE Encyclopedia of Qualitative Research Methods. Thousand Oaks: Sage; 2008. pp. 875–876.
    1. Sparkes E, Duarte RV, Raphael JH, Denny E, Ashford RL. Qualitative exploration of psychological factors associated with spinal cord stimulation outcome. Chronic Illn. 2011;8(4):239–251. doi: 10.1177/1742395311433132.
    1. Starks H, Trinidad SB. Choose your method: a comparison of phenomenology, discourse analysis, and grounded theory. Qual. Health Res. 2007;17(10):1372–1380. doi: 10.1177/1049732307307031.
    1. Strauss A, Corbin J. Basics of Qualitative Research: Techniques and Procedures for Developing Grounded Theory. 2. Thousand Oaks: Sage; 1998.
    1. Turner A, Barlow J, Ilbery B. Play hurt, live hurt: living with and managing osteoarthritis from the perspective of ex-professional footballers. J. Health Psychol. 2002;7(3):285–301. doi: 10.1177/1359105302007003222.
    1. Tutton E, Seers K, Langstaff D, Westwood M. Staff and patient views of the concept of hope on a stroke unit: a qualitative study. J. Adv. Nurs. 2012;68(9):2061–2069. doi: 10.1111/j.1365-2648.2011.05899.x.
    1. Urquhart C. Grounded Theory for Qualitative Research: A Practical Guide. Thousand Oaks: Sage; 2013.
    1. Vandecasteele T, Debyser B, Van Hecke A, De Backer T, Beeckman D, Verhaeghe S. Nurses’ perceptions of transgressive behaviour in care relationships: a qualitative study. J. Adv. Nurs. 2015;71(12):2786–2798. doi: 10.1111/jan.12749.
    1. van Manen M, Higgins I, van der Reit P. A conversation with Max van Manen on phenomenology in its original sense. Nurs. Health Sci. 2016;18(1):4–7. doi: 10.1111/nhs.12274.
    1. Walker JL. The use of saturation in qualitative research. Can. J. Cardiovasc. Nurs. 2012;22(12):37–41.
    1. Zhao X, Davey G. Contesting modernity: tobacco use and romanticism among older Dai farmers in Xishuangbanna, China. Soc. Health Illn. 2015;37(8):1173–1190. doi: 10.1111/1467-9566.12305.

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