Your protocol includes a description of how you will extract data from your screened and appraised articles.
Some elements you will need to decide about data extraction plan include:
For reporting your data extraction plan in your protocol, see items PR23-PR26 in Cochrane's MECIR Manual or items 11c-13 in the PRISMA-P Explanation and Elaboration paper.
For a full description of the data extraction step, see Chapter 5 in the Cochrane Handbook for Systematic Reviews of Interventions version 6.3, or one of the other resources below:
You should plan to extract data that is relevant to answering the question posed in your systematic review. It may help to consult other similar systematic reviews to identify what data to collect. You should use your key questions and your eligibility criteria as a starting point. It can also help to think about your question in a framework such as PICO.
Data to be extracted may include:
If you plan to synthesize data, you will want to collect additional information such as sample sizes, effect sizes, dependent variables, reliability measures, pre-test data, post-test data, follow-up data, and statistical tests used.
This is the step where you go back through your list of intervention intentions and match them with the data to extract. Having these present will guide you in gathering data as well as noticing any gaps in the research you are assessing. Here are some questions you can think about and address at this stage of the process:
This is the time to make note of those things and continue with data extraction!
The point is to provide transparency and a full context. This can highlight underlying issues indirectly related to the topic.
The goal is to talk about your procedure and your reasons for research while also acknowledging some of the information that may need more information.
Covidence is web-based software including data extraction and consensus. Easy export to popular statistical analysis programs. Read more about its extraction tool, Extraction 2.0. (Free trial for individual use, fee-based for teams)
DistillerSR is web-based software with support for data extraction and analysis. Algorithms assist during screening and extraction. It guides reviewers in creating project-specific forms, extracting, and analyzing data. Free trial for individual students; fee-based for faculty and longer student projects.
Colandr is free web-based software with support for data extraction and export in CSV format (openable in Excel). Algorithms assist during screening and extraction.
RevMan is free software with support for data extraction and analysis. It offers collection forms for descriptive information on population, interventions, and outcomes, and quality assessments, as well as for data for analysis and forest plots. Has a web-based and a desktop version.
JBI Sumari is web-based software with support for data extraction and synthesis. Fee-based; free 14-day trial.
The Systematic Review Toolbox:
The SR Toolbox is a community-driven, searchable, web-based catalogue of tools that support the systematic review process across multiple domains. Use the advanced search option to restrict to tools specific to data extraction.
SRDR+ is free web-based software for the extraction and management of data for systematic review or meta-analysis. It is also an open and searchable archive of systematic reviews and their data, and has a training environment, tutorials, and example templates of systematic review data extraction forms. Access the "Extracting Data" tutorial for more information.
You can create custom extraction forms in Excel. Spreadsheet functions such as drop-down menus and range checks can speed up the process and help prevent data entry errors. Relational databases (such as Microsoft Access) can help you extract information from different categories like citation details, demographics, participant selection, intervention, outcomes, etc. A more advanced approach to using Excel for this purpose is the PIECES approach, designed by a librarian at Texas A&M. The PIECES workbook is downloadable at this guide.
To record the data, you can also use online survey forms such as RedCAP, Qualtrics, or Survey Monkey, or design and create your own coded fillable forms using Adobe Acrobat Pro or Microsoft Access.
Guidance for creating your own
Elamin MB, Flynn DN, Bassler D, et al. Choice of data extraction tools for systematic reviews depends on resources and review complexity. J Clin Epidemiol. 2009;62(5):506-510. doi:10.1016/j.jclinepi.2008.10.016. - Advice on how to decide what electronic tools to use to extract data for analytical reviews
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