Systematic Reviews

The data extraction/collection step of the systematic review process is perhaps the most time and labor intensive. It is the process of extracting data from studies you considered relevant to your review and organizing that data in a way that will allow you to synthesize the evidence and make conclusions. Expect to:

• Extract relevant data from each individual study
• Have at least two independent reviewers extract the data to reduce bias and avoid mismatches (typos)  
• Use spreadsheets, structured forms, or data collection software to keep this information organized and easily accessible 

Putting together a data collection form should be considered early in the systematic review process. There is not one form that will be applicable to all reviews as data collected will depend on your research question and inclusion criteria. 

Information commonly collected may include:

• Article citation/author information
• Study methods
• Population/patient characteristics
• Intervention and comparator group characteristics
• Study outcome

The National Academies Press/IOM Manual has a good table outlining the Types of Data Extracted from Individual Studies 

• Cochrane Training - Data collection form for RCTs

  The Cochrane Collaboration provides an example of a data collection form for randomized controlled trials.

• Cochrane Handbook for Systematic Reviews of Interventions

  Chapter 5: Collecting Data (2022)

• Data Extraction - AHRQ.gov

  Presentation slides from The AHRQ Training Modules for the Systematic Reviews Methods Guide: An Introduction. Link will open up in PowerPoint.

Modified with permission from  https://henryford.libguides.com/sr

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