Objective: To update the current characteristics about the scope and quality of mixed methods research (MMR) in complementary and alternative medicine (CAM) after nearly 10 years.
Methods: A 5-stage approach for conducting a scoping review was adopted. Articles published on the top 10 journals in CAM with the highest impact factor in 2020 were screened for MMR. Information of included articles were extracted, and then synthesized to illustrate the current state. Methodological quality was evaluated according to the Mixed Method Appraisal Tool (MMAT) 2018 version.
Results: A total of 55 (55/2991, 2%) articles using mixed methods were retrieved, including 17 medical studies and 38 ethnobotanical studies. We performed an in-depth analysis on the 17 medical studies, which studied cancer, stress, pain, fatigue, exercises, mindfulness intervention, herbal medicine use, art and acupuncture. Thirteen pilot studies applied MMR to evaluate the feasibility of interventions or programs (13/17, 76%); phenomenology was inferred as the most common philosophical assumptions (13/17, 76%); the most applied type of MMR was convergent design (16/17, 94%); integration often took place at integration (12/17, 71%). Among the 16 eligible studies for quality appraisal, majority were rated as good (14/16, 88%), whereas two studies were rated as poorly described. Primarily, a poor rating was due to incomplete reporting of data analysis and citations in qualitative components; lack of confounder controlling and the sampling strategy in quantitative components; poor description of integration and justification for mixed methods. Comparing with the previous review, fewer MMR were published in 2020 in CAM, but the proportion of studies that clearly reported MMR has increased by 4 times (4%→15%).
Conclusion: CAM researchers need to realize the benefits that MMR can have on conducting further health care research. Our findings highlight that applying MMR will be helpful to understand the complex dynamics and interdisciplinary nature of complex intervention. In addition, addressing a standardized reporting criteria for MMR is recommended.
Keywords: biomedical research; complementary therapies; mixed methods; pilot projects; review.