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Summary points
Appraising qualitative research is different from appraising quantitative research
Qualitative research papers should show appropriate sampling, data collection, and data analysis
Transferability of qualitative research depends on context and may be enhanced by using theory
Ethics in qualitative research goes beyond review boards' requirements to involve complex issues of confidentiality, reflexivity, and power
Over the past decade, readers of medical journals have gained skills in critically appraising studies to determine whether the results can be trusted and applied to their own practice settings. Criteria have been designed to assess studies that use quantitative methods, and these are now in common use.
In this article we offer guidance for readers on how to assess a study that uses qualitative research methods by providing six key questions to ask when reading qualitative research (box 1). However, the thorough assessment of qualitative research is an interpretive act and requires informed reflective thought rather than the simple application of a scoring system.
Box 1 Key questions to ask when reading qualitative research studies
Was the sample used in the study appropriate to its research question?
Were the data collected appropriately?
Were the data analysed appropriately?
Can I transfer the results of this study to my own setting?
Does the study adequately address potential ethical issues, including reflexivity?
Overall: is what the researchers did clear?
Was the sample used in the study appropriate to its research question?
One of the critical decisions in a qualitative study is whom or what to include in the sample-whom to interview, whom to observe, what texts to analyse. An understanding that qualitative research is based in experience and in the construction of meaning, combined with the specific research question, should guide the sampling process. For example, a study of the experience of survivors of domestic violence that examined their reasons for not seeking help from healthcare providers might focus on interviewing a sample of such survivors (rather than, for example, healthcare providers, social services workers, or academics in the field). The sample should be broad enough to capture the many facets of a phenomenon, and limitations to the sample should be clearly justified. Since the answers to questions of experience and meaning also relate to people's social affiliations (culture, religion, socioeconomic group,...