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Open Access Highly Accessed Research article

Worked examples of alternative methods for the synthesis of qualitative and quantitative research in systematic reviews

Patricia J Lucas1, Janis Baird2, Lisa Arai3, Catherine Law4 and Helen M Roberts3*

Author Affiliations

1 School for Policy Studies, University of Bristol, 8 Priory Rd, Bristol BS8 1TZ, UK

2 MRC Environmental Resource Centre, University of Southampton, UK

3 Child Health Research & Policy Unit, City University, UK

4 Institute of Child Health, University College London, UK

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BMC Medical Research Methodology 2007, 7:4  doi:10.1186/1471-2288-7-4

Published: 15 January 2007

Abstract

Background

The inclusion of qualitative studies in systematic reviews poses methodological challenges. This paper presents worked examples of two methods of data synthesis (textual narrative and thematic), used in relation to one review, with the aim of enabling researchers to consider the strength of different approaches.

Methods

A systematic review of lay perspectives of infant size and growth was conducted, locating 19 studies (including both qualitative and quantitative). The data extracted from these were synthesised using both a textual narrative and a thematic synthesis.

Results

The processes of both methods are presented, showing a stepwise progression to the final synthesis. Both methods led us to similar conclusions about lay views toward infant size and growth. Differences between methods lie in the way they dealt with study quality and heterogeneity.

Conclusion

On the basis of the work reported here, we consider textual narrative and thematic synthesis have strengths and weaknesses in relation to different research questions. Thematic synthesis holds most potential for hypothesis generation, but may obscure heterogeneity and quality appraisal. Textual narrative synthesis is better able to describe the scope of existing research and account for the strength of evidence, but is less good at identifying commonality.