2.3. Data extraction and quality assessment
This protocol is extracted from research article:
Music-based interventions for pain relief in patients undergoing hemodialysis
Medicine (Baltimore), Jan 15, 2021; DOI: 10.1097/MD.0000000000024102

Full-text eligible studies were reviewed and relevant data were extracted by two independent authors (JR Chen and HX Hong). Basic characteristics of patients and clinical trials were collected as follows: first author, publication year, mean age, gender distribution, case number, follow-up, interventions in control and music group, and conclusions. Furthermore, quantitative pain-related inventory information, such as visual analogue scale (VAS), McGill pain questionnaire (MPQ), and brief pain inventory (BPI), was also extracted. All disagreements were solved by discussion.

To evaluate the quality of eligible studies, Jadad scale including three dimensions (randomized, double-blind and description of withdrawal and dropout) was applied.[19] According to Jadad scale, each study will be score ranging from 0 to 5, with a higher score representing higher quality of study design. The threshold of high quality study is 3 points, whereas study with score <2 would be considered as low quality design. The quality assessment was performed by two independent authors (JR Chen and HX Hong).

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