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Spiral comparison: operationalizing iterative integration in mixed methods research
Ashley R Turner1, Timothy C Guetterman2
1College of Nursing, University of Colorado Anschutz Medical Campus, 13120 E 19th Ave, Aurora, CO, 80045, USA. Ashley.2.turner@cuanschutz.edu.
BMC Medical Research Methodology
|May 12, 2026
Summary
This study introduces spiral comparison, a novel mixed methods research approach for iterative data integration and synthesis. It enhances understanding of complex phenomena, offering a replicable method for study design and analysis in health sciences.
Area of Science:
- Health Sciences Research Methodology
- Mixed Methods Research Design
- Qualitative and Quantitative Synthesis
Background:
- Mixed methods research integrates qualitative depth with quantitative breadth for comprehensive understanding.
- Spiral approaches offer iterative integration but lack clear operationalization.
- Existing spiral models in mixed methods research are conceptual and limit broader application.
Purpose of the Study:
- To present spiral comparison as a replicable method for mixed methods study design and synthesis.
- To operationalize spiral approaches within a convergent mixed methods-grounded theory study.
- To enhance the understanding of motivation for physical activity in an underserved population.
Main Methods:
- Descriptive methodological paper detailing the spiral comparison approach.
- Convergent mixed methods-grounded theory design.
- Cyclical integration of qualitative and quantitative data throughout collection and analysis, using joint displays.
Main Results:
- Spiral comparison facilitated iterative data collection, analysis, and theoretical sampling.
- Identified key incongruences, prompted sampling updates, and refined analytic focus.
- Enabled the derivation of a grounded theory model for physical activity motivation.
Conclusions:
- Spiral comparison offers a structured, replicable method for navigating complexity in mixed methods research.
- The approach enhances transparency, rigor, and theory development.
- Advocates for broader adoption of spiral comparison in health sciences and other research fields.
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