# How to Create a PRISMA Flow Diagram from Your Zotero Library ## Quick Answer - Track screening decisions directly in Zotero using custom collections and saved searches, then export item counts to build your PRISMA flow diagram. - Use the PRISMA 2020 template from the EQUATOR Network to structure your diagram and report transparently. - Manual counting in Zotero remains error-prone for large libraries, so verify all counts against your exported data before submission. ## Understanding PRISMA Flow Diagrams and Their Purpose Systematic reviews and meta-analyses depend on transparent reporting of how studies were identified, screened, and selected. The PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) flow diagram provides a standardized visual representation of this process. It shows the number of records identified through database searching, records after duplicate removal, records screened, full-text articles assessed for eligibility, studies included in qualitative synthesis, and studies included in quantitative synthesis. The EQUATOR Network serves as a central repository for reporting guidelines across health research. It hosts the PRISMA statement and its extensions, making it the authoritative source for selecting the correct reporting guideline for your review type. When you prepare a systematic review, consulting the EQUATOR Network ensures you use the current version of PRISMA and any relevant extensions for your specific study design. The flow diagram serves multiple functions. It allows readers to assess the completeness of your search strategy, evaluate potential selection bias, and understand why specific studies were excluded. Journals increasingly require this diagram as a condition of publication for systematic reviews. Funding agencies, including the National Institutes of Health, expect rigorous methodology in the research they support, and transparent reporting through PRISMA diagrams demonstrates methodological quality. ## Why Zotero Is Suitable for Systematic Review Screening Zotero functions as a reference management tool that can support systematic review workflows when configured properly. Its ability to create collections, subcollections, and saved searches makes it possible to track the movement of references through the screening process. The software allows you to organize references into hierarchical collections that mirror your screening stages. You can create a collection for records identified from each database, a collection for records after duplicate removal, and separate collections for records excluded at title and abstract screening versus full-text screening. This structure provides a clear audit trail of your decisions. Zotero also supports tags, which offer another method for tracking screening decisions. You can assign tags such as "included," "excluded," "full-text review," or "duplicate" to individual references. Saved searches can then automatically group references based on these tags, giving you real-time counts of how many records fall into each category. The software's ability to export collections and search results as CSV or RIS files means you can transfer your screening data to spreadsheet software for verification. This export function becomes essential when you need to produce accurate counts for your PRISMA diagram. ## Setting Up Your Zotero Library for Screening ### Creating a Dedicated Systematic Review Folder Before you begin screening, establish a clean organizational structure. Create a top-level collection named for your systematic review, including the review title and date. Within this collection, create subcollections that correspond to each stage of your PRISMA flow diagram. Your subcollection structure should include: - Records identified from databases - Records identified from other sources - Records after duplicate removal - Records screened at title and abstract level - Records excluded at title and abstract level - Full-text articles assessed for eligibility - Full-text articles excluded with reasons - Studies included in qualitative synthesis - Studies included in quantitative synthesis This structure mirrors the PRISMA 2020 flow diagram template available through the EQUATOR Network. By matching your Zotero organization to the reporting template, you reduce the risk of missing counts when you construct your diagram. ### Importing Search Results from Databases When you run your search across multiple databases, export the results from each database separately. Most databases allow you to export citations in RIS format, which Zotero imports natively. Create a separate subcollection for each database's results, such as PubMed, Embase, Web of Science, and Cochrane Library. This database-specific organization serves two purposes. First, it allows you to track how many records came from each source, which PRISMA requires you to report. Second, it enables you to identify and remove duplicates more systematically. After importing each database's results, run a duplicate detection process. Zotero has a built-in duplicate detection feature that compares titles, authors, and other metadata. However, this feature may not catch all duplicates, particularly when citations have slight variations in formatting. Manual review of potential duplicates is often necessary. ### Using Tags for Screening Decisions Tags provide a flexible method for recording screening decisions without moving references between collections. You can create a standardized tag system before screening begins: - "Screen: Include" - "Screen: Exclude" - "Screen: Full Text" - "Exclude: Wrong Population" - "Exclude: Wrong Intervention" - "Exclude: Wrong Outcome" - "Exclude: Wrong Study Design" - "Exclude: Duplicate" This tag system allows you to record both the decision and the reason for exclusion. The reason tags become valuable when you complete your PRISMA diagram, as the template asks you to report the number of full-text articles excluded and the primary reasons for exclusion. ## Step-by-Step Process for Tracking Screening Decisions ### Step 1: Remove Duplicates and Record the Count Begin by running Zotero's duplicate detection feature on your combined database results. The software identifies potential duplicates based on matching metadata fields. Review each potential duplicate pair and merge or remove as appropriate. Record the total number of records imported from all sources and the number of duplicates removed. These two figures form the first two boxes of your PRISMA flow diagram. The number of records after duplicate removal becomes your screening denominator. For large libraries, consider using a systematic approach to duplicate detection. Sort your library by title and visually scan for near-duplicates that the automated feature may have missed. This manual check is particularly important for records with incomplete metadata or variations in author name formatting. ### Step 2: Screen Titles and Abstracts Title and abstract screening involves applying your eligibility criteria to each record based on the information available in the title and abstract alone. During this stage, you typically exclude records that clearly do not meet your inclusion criteria. In Zotero, you can conduct this screening by working through your "Records after duplicate removal" collection. For each record, assign a tag indicating whether it moves forward to full-text review or is excluded. If you are screening in duplicate, as recommended for systematic reviews, you may want to create separate collections for each reviewer's decisions. After completing title and abstract screening, use a saved search to count the records tagged for full-text review and the records tagged as excluded. These counts populate the next section of your PRISMA diagram. ### Step 3: Retrieve and Screen Full-Text Articles For records that pass title and abstract screening, you must retrieve the full-text articles. Create a collection named "Full-text articles assessed for eligibility" and move or add the included records to this collection. As you obtain each full-text article, assess it against your eligibility criteria. Record your decision using tags. For excluded articles, assign a reason tag that documents why the article does not meet your criteria. The PRISMA flow diagram requires you to report the number of full-text articles excluded and the reasons for exclusion. Common exclusion reasons include wrong population, wrong intervention, wrong comparator, wrong outcome, wrong study design, and inability to retrieve the full text. ### Step 4: Track Included Studies After full-text screening, the remaining records constitute your included studies. Create a collection for "Studies included in qualitative synthesis" and add the final included records. If you plan to conduct meta-analysis, create a separate collection for "Studies included in quantitative synthesis." Some studies may be included in qualitative synthesis but excluded from quantitative synthesis due to insufficient data or methodological heterogeneity. Your final included studies collection should contain only the records that meet all eligibility criteria. Verify this collection against your screening documentation to ensure no records were accidentally omitted or included in error. ## Exporting Counts from Zotero for Your PRISMA Diagram ### Using Saved Searches to Generate Counts Saved searches in Zotero allow you to create dynamic collections that automatically update based on your specified criteria. You can create a saved search that shows all records tagged with a particular screening decision. For example, create a saved search with the condition "Tag contains Screen: Include" to display all records you have tagged for inclusion. The collection header in Zotero displays the number of items in that saved search, giving you an immediate count. To create a saved search, click the gear icon in the Zotero toolbar and select "New Saved Search." Name the search descriptively, such as "Included after full-text review," and set the conditions to match your tag system. ### Exporting Collection Data to CSV For verification purposes, export your collections to CSV format. Right-click on a collection and select "Export Collection." Choose CSV as the file format and save the file to your computer. Open the CSV file in spreadsheet software to review the records and verify the count matches what Zotero displays. This verification step catches discrepancies that may arise from tagging errors or collection mismatches. The CSV export also provides a permanent record of which references were in each collection at the time of export. This documentation supports the transparency requirements of systematic review reporting. ### Building Your PRISMA Diagram With your verified counts, you can construct your PRISMA flow diagram. The PRISMA 2020 flow diagram template, available through the EQUATOR Network, provides the standard structure. You can download the template and fill in your numbers. The template includes boxes for: - Records identified from databases and registers - Records identified from other sources - Records after duplicates removed - Records screened - Records excluded - Full-text articles assessed for eligibility - Full-text articles excluded with reasons - Studies included in qualitative synthesis - Studies included in quantitative synthesis Fill in each box with the corresponding count from your Zotero collections. Ensure the numbers are internally consistent. For example, the number of records screened should equal the number of records after duplicate removal, and the number of full-text articles assessed should equal the number of records that passed title and abstract screening. ## At a Glance | Screening Stage | Zotero Organization Method | Count Verification Approach | | --- | --- | --- | | Records identified from databases | Separate collection per database | Export each collection to CSV and count rows | | Records after duplicate removal | Combined collection with duplicates merged | Run duplicate detection and manually verify | | Records screened at title and abstract | Tags for include or exclude decisions | Create saved searches for each tag and check counts | | Full-text articles assessed for eligibility | Collection for full-text review | Export collection and verify against screening log | | Studies included in synthesis | Final included studies collection | Cross-check against full-text screening decisions | ## Common Failure Patterns and How to Avoid Them ### Inconsistent Tag Usage One of the most common errors in using Zotero for systematic review screening is inconsistent tag application. Reviewers may use slightly different tag names, such as "Include" versus "Screen: Include," which breaks saved searches and produces inaccurate counts. Standardize your tag system before screening begins and document it in your review protocol. Use a consistent naming convention and avoid creating new tags during the screening process unless you update your documentation. ### Duplicate Records That Escape Detection Zotero's duplicate detection feature relies on metadata matching. Records with incomplete metadata, such as missing DOIs or variations in author names, may not be identified as duplicates. These undetected duplicates inflate your screening counts and can lead to double-counting in your PRISMA diagram. After running automated duplicate detection, manually review your library sorted by title. Look for records with similar titles that may represent the same publication. Pay particular attention to conference abstracts that were later published as full papers. ### Counting Errors During Manual Tallying Manually counting records in Zotero collections can introduce errors, particularly in large libraries. The collection header displays a count, but this count may not reflect your screening decisions if you have not consistently applied tags or moved records between collections. Always verify counts using saved searches or CSV exports instead of relying on visual inspection. Cross-check your counts against your screening documentation to ensure consistency. ### Failure to Document Exclusion Reasons The PRISMA flow diagram requires you to report the number of full-text articles excluded and the reasons for exclusion. If you do not record exclusion reasons during screening, you will need to revisit each excluded article to determine why it was excluded, which is time-consuming and may introduce recall bias. Record exclusion reasons as tags during the screening process. This practice ensures you have the information needed to complete your PRISMA diagram accurately. ## Records and Measurements for Systematic Review Transparency ### Maintaining a Screening Log Beyond your Zotero library, maintain a screening log that documents your screening process. This log should include the date each screening stage was completed, the number of records screened, and any issues encountered. A screening log supports transparency and reproducibility. It also provides documentation that may be requested by journal editors or peer reviewers during the publication process. ### Documenting Search Strategies Your PRISMA flow diagram should be accompanied by a detailed description of your search strategy. This description includes the databases searched, the search dates, and the search terms used. The EQUATOR Network emphasizes the importance of complete and transparent reporting in systematic reviews. Store your search strategies in a separate document or appendix. Include the full search string for each database, as this information allows readers to replicate your search. ### Tracking Screening Decisions Over Time Systematic reviews often take months to complete, and screening decisions may evolve as reviewers become more familiar with the literature. Track changes to your screening decisions and document any protocol amendments. If you revise your eligibility criteria during the screening process, document the revision and its rationale. This documentation supports the integrity of your review and addresses potential concerns about post hoc decision-making. ## Using Zotero with Other Systematic Review Tools ### Integration with Spreadsheet Software While Zotero can track screening decisions, many systematic reviewers use spreadsheet software for data extraction and risk of bias assessment. You can export your included studies from Zotero to a spreadsheet and use this file for subsequent review stages. The CSV export function in Zotero creates a file that opens directly in spreadsheet software. Include columns for citation information, screening decisions, and any notes you recorded during screening. ### Exporting to Systematic Review Software Some systematic review software packages can import references from Zotero. This integration allows you to use Zotero for reference management while using specialized software for screening and data extraction. Check the documentation for your chosen systematic review software to determine the supported import formats. RIS and CSV are commonly supported formats that Zotero can export. ### Maintaining Your Zotero Library After Screening After completing your systematic review, your Zotero library remains a valuable resource. The organized collections and tags document your screening process and can be shared with collaborators or included as supplementary material. Consider exporting your final included studies collection as a RIS file for inclusion in your review's supplementary materials. This file allows readers to import your included studies into their own reference management software. ## Welfare and Safety Context for Research Integrity ### Protecting Against Research Misconduct The Committee on Publication Ethics (COPE) Core Practices emphasize the importance of research integrity, including proper data management and transparent reporting. A well-documented PRISMA flow diagram supports these practices by providing a clear audit trail of your review process. Fabricating or misrepresenting screening counts constitutes research misconduct. The COPE Core Practices address misconduct including fabrication, falsification, and plagiarism. Accurate PRISMA diagrams protect you from allegations of misconduct by demonstrating the rigor of your methods. ### Data Management and Sharing Considerations The National Institutes of Health Data Management and Sharing Policy requires researchers to plan for managing and sharing data generated through NIH-funded research. While this policy applies specifically to NIH-funded projects, the principles of good data management apply broadly. Your Zotero library and screening documentation constitute research data. Plan for how you will preserve and potentially share this data. Consider depositing your screening documentation in a data repository to support reproducibility. ### Researcher Identity and Attribution The ORCID initiative provides researchers with a persistent digital identifier that distinguishes them from other researchers. Maintaining an ORCID record ensures proper attribution for your systematic review work. Link your ORCID to your publications and research outputs. This linkage supports accurate attribution and helps ensure you receive credit for your systematic review contributions. ## Limitations of Using Zotero for PRISMA Flow Diagrams ### Lack of Built-In Screening Workflow Zotero was not designed specifically for systematic review screening. It lacks features found in dedicated systematic review software, such as dual-reviewer screening workflows, conflict resolution, and automatic PRISMA diagram generation. Your Zotero-based workflow requires manual setup and careful maintenance. The software does not automatically track screening decisions or generate counts for your PRISMA diagram. You must create the organizational structure and tag system yourself. ### Potential for Human Error Manual processes are susceptible to human error. Reviewers may forget to tag a record, apply the wrong tag, or accidentally move records between collections. These errors can produce inaccurate counts in your PRISMA diagram. Mitigate this risk through verification steps. Export your collections and cross-check counts against your screening documentation. Consider having a second reviewer independently verify your counts. ### Scalability Concerns For very large systematic reviews with thousands of records, Zotero may become unwieldy. The software can handle large libraries, but screening thousands of records through a manual tagging process is time-consuming. If your review involves more than a few thousand records, consider using dedicated systematic review software that supports more efficient screening workflows. These tools often include features for batch screening and automated duplicate detection. ## Professional Escalation Criteria ### When to Seek Additional Support If you encounter persistent issues with your Zotero-based screening workflow, consider seeking support from your institution's library or research support services. Many academic libraries employ librarians with systematic review expertise who can provide guidance on reference management and screening workflows. For complex systematic reviews, consider consulting a methodologist or statistician. These professionals can advise on screening procedures, risk of bias assessment, and data synthesis methods. ### When to Consider Alternative Tools If your Zotero workflow becomes unmanageable or you require features that Zotero does not provide, consider transitioning to dedicated systematic review software. Tools such as Covidence, Rayyan, and DistillerSR offer specialized screening workflows and automatic PRISMA diagram generation. Before transitioning, export your Zotero library and screening documentation to ensure you preserve your work. Most systematic review software can import references from Zotero, but your tags and collections may not transfer automatically. ### When to Consult Reporting Guidelines The EQUATOR Network provides access to reporting guidelines for various study types. If you are unsure which reporting guideline applies to your review, consult the EQUATOR Network to identify the appropriate guideline. For systematic reviews, PRISMA is the standard reporting guideline. However, extensions exist for specific review types, such as PRISMA-ScR for scoping reviews and PRISMA-S for search reporting. Select the appropriate guideline for your review type. ## Frequently Asked Questions ### Can Zotero automatically generate a PRISMA flow diagram? No, Zotero does not have a built-in feature to generate PRISMA flow diagrams. You must manually track screening decisions using collections and tags, then export counts to create your diagram using a template from the EQUATOR Network. ### How do I count records in a Zotero collection? The collection header in Zotero displays the number of items in that collection. For more reliable counts, export the collection to CSV format and count the rows in spreadsheet software. ### What is the best way to track exclusion reasons in Zotero? Use tags to record exclusion reasons. Create standardized tags such as "Exclude: Wrong Population" and apply them to records during full-text screening. This practice ensures you have the information needed for your PRISMA diagram. ### Can I use Zotero for dual-reviewer screening? Zotero does not have built-in support for dual-reviewer screening. You can create separate collections for each reviewer's decisions, but you will need to manually compare results and resolve conflicts. ### How do I export my Zotero library for use in other software? Right-click on a collection and select "Export Collection." Choose RIS or CSV format depending on your needs. RIS is suitable for importing into other reference management tools, while CSV works well for spreadsheet analysis. ### Does the PRISMA flow diagram template include all necessary boxes? The PRISMA 2020 flow diagram template includes boxes for records identified, duplicates removed, records screened, records excluded, full-text articles assessed, full-text articles excluded with reasons, and studies included in synthesis. Download the current template from the EQUATOR Network to ensure you use the correct version. ### What should I do if my Zotero counts do not match my screening documentation? Investigate the discrepancy by reviewing your tags and collections. Check for untagged records, incorrectly applied tags, or records that were moved between collections. Correct any errors and re-verify your counts before completing your PRISMA diagram. ### Is it acceptable to use Zotero for systematic review screening in a funded project? Yes, Zotero can be used for systematic review screening in funded projects. However, ensure your methods comply with any requirements from your funding agency. The National Institutes of Health Data Management and Sharing Policy, for example, requires planning for data management and sharing, which includes documenting your screening process. ## Using the Evidence | Source | Best use in this topic | Important limitation | |---|---|---| | [Research Methods Resources](https://www.ncbi.nlm.nih.gov/books) | official guidance | Check the linked page for current local requirements | | [EQUATOR Network](https://www.equator-network.org/) | official guidance | Check the linked page for current local requirements | | [Core Practices](https://publicationethics.org/core-practices) | official guidance | Check the linked page for current local requirements | ## Related Articles - [Protein Synthesis Step By Step](/blog/guides/protein-synthesis-step-by-step) - [Protein Synthesis: A Step-by-Step Guide to Transcription and Translation](/blog/guides/protein-synthesis-a-step-by-step-guide-to-transcription-and-translation) - [Gene Flow](/blog/guides/gene-flow) - [Genetic Flow](/blog/guides/genetic-flow) - [Genomic Library](/blog/guides/genomic-library) ## References and Further Reading - [Research Methods Resources](https://www.ncbi.nlm.nih.gov/books). National Library of Medicine. - [EQUATOR Network](https://www.equator-network.org/). EQUATOR Network. - [Core Practices](https://publicationethics.org/core-practices). Committee on Publication Ethics. - [NIH Grants and Funding](https://grants.nih.gov/). National Institutes of Health. - [ORCID for Researchers](https://info.orcid.org/researchers). ORCID. - [Data Management and Sharing Policy](https://sharing.nih.gov/data-management-and-sharing-policy). National Institutes of Health. - [NCBI Literature Resources](https://www.ncbi.nlm.nih.gov/). National Center for Biotechnology Information. - [PubMed](https://pubmed.ncbi.nlm.nih.gov/). National Library of Medicine. > This article is educational and does not replace institutional policy, professional advice, or applicable safety and regulatory requirements.