De-duplicating EndNote results against a previous search

Well hello my friends! It’s been a long time since I’ve posted. Forgive me, as much has happened in the last year, including: moving across an ocean, subsequently moving across a city, starting a busy freelance information specialist business, and many mundane crises, trips, and side-projects in between.

I was tasked recently with updating a systematic review search with a new and improved search strategy completely unlike the previous one. There were new search terms added to this search, but also several irrelevant search terms that had been deleted. I’d done systematic review updates before, but I’d always simply used date filters in the databases to capture results from the date of previous search.

But this time, the researchers wanted any articles that would be captured by the new search, in any date period, and wanted to ensure they weren’t screening any citations that had already been previously screened with the old search.

I’d heard other information specialists talk about using EndNote to de-duplicate against a previous search, but never tried it myself. It just seemed unduly complicated. Date filters seemed to be working perfectly fine.

It was around this same time that I found out that date filters were not perfectly fine.

One day, I went to date limit an Embase search using the advice from a LibGuide at a high-ranking university…. and was horrified to find out that a not insignificant number of citations that ought to have been picked up had not.

Cue a minor panic as I tried to figure out whether I had royally screwed up any of my previous projects.

Friends, I have learned the error of my ways, and will henceforth de-duplicate my systematic review update searches in EndNote when possible. Cross my heart, etc, etc.

As usual when picking up a new skill, I went to Twitter to see what all the experts were doing.

Hi #sysrev / #medlibs friends – what’s the best method of running a search update with revisions (not your original search) and deduplicating such that the original results would be removed? Is there a not painful way of doing this?

— Amanda 🕵️‍♀️ (@v_woolf) April 30, 2019

Here follows the method that I ended up using. I’ve documented it for my own purposes and hope that it can come in handy for others as well.

1. De-duplicate your total search results in EndNote, as normal.

You can use whatever process works best for you. I tend to use a modified version of Bramer et al, 2016 in which I progressively choose different field combinations in EndNote to test for duplicates, and manually go through the results. The field combinations suggested in the article include (in this order):

• Author | Year | Title | Secondary Title (Journal)
• Author | Year | Title | Pages
• Title | Volume | Pages
• Author | Volume | Pages
• Year | Volume | Issue | Pages
• Title
• Author | Year

But if you want to get fancy about it, the article supplies a more complicated process than this.

2. Label your citations by search date.

At this point, you’ll want to load up your citations from the previously conducted search into a separate EndNote Library. Then, use one of the custom fields to mark these citations.

1. Select one of your citations from the “All Refs” group, then click cmd + A or ctrl + A to select all in the entire library.
2. Then, go to tools, then Change/move/copy fields
3. Select “Custom 1” (or another field of your choosing), then “replace whole field with”
4. Choose text that is meaningful for you for remembering which citations these are. Something as simple as “OLD” may suffice (this is what I did, based on a Twitter tip).
5. Next, do the same for your “new” search results.

Note that this is an important step if your search strategy has changed such that some results that were previously returned will not be returned in the new search. Otherwise, you will end up re-screening those articles!

3. Combine your “old” and “new” EndNote Libraries together

To combine your two libraries together, navigate to your “old” library and select all the citations by clicking ctrl + A or cmd + A.

Then click “references”, then “copy references to”, and choose your “new” library. Easy peasy!

4. Remove duplicates

Use your EndNote Library which contains both your “old” and “new” records (both of which have previously had duplicates removed!), and remove your duplicates as you normally do, or following the process in Step 1.

But this time, there’s one big difference – every time you find a duplicate, instead of removing the duplicate record, you’ll remove BOTH records, since they represent a previously screened record that you won’t need to screen again.

5. Remove any remaining previously screened citations

This step won’t be necessary if no search terms have been removed since the original search was conducted.

In my case, the search had changed drastically since its creation by someone else, and I needed to remove any citations that were picked up by the original search, but not by the new one. Removing these records is easy if you have followed Step 2, above!

Simply create a smart group by right-hand clicking over “my groups” in EndNote. Then, set the parameters to find your old citations (e.g. “custom 1”, “is”, “OLD”). Then, navigate to your smart group and delete all the citations in this group. These have already been previously screened and weren’t retrieved by the new search.

—

And that’s basically it! I was able to tackle this new skill that originally seemed kind of hard, and you can too!

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For more information, the following papers may also be useful:

Bramer WM, Bain P. Updating search strategies for systematic reviews using EndNote. Journal of the Medical Library Association: JMLA. 2017 Jul;105(3):285.

Bramer WM, Giustini D, de Jonge GB, Holland L, Bekhuis T. De-duplication of database search results for systematic reviews in EndNote. Journal of the Medical Library Association: JMLA. 2016 Jul;104(3):240.

“How many citations will I have to screen?”

I get asked this question a lot at the beginning stages of a review project. It’s a fair question: researchers want to know what their screening workload is going to look like, and screening abstracts is a tedious process.

There’s some great research happening right now on how to make screening less tedious – using text mining to automate or semi-automate the process, for example. These are promising approaches, but for now, most reviews need a human eye to oversee study selection for at least part of the process.

I used to get flustered when I was asked this question because I was afraid of giving the wrong answer and underestimating the amount of work a researcher would later have to do. On the other hand, if I overestimated the number of citations to screen, a researcher might want to change the search strategy to lower the number of citations or otherwise change the methodology.

I also didn’t have a very good answer. It’s hard to estimate the number of citations to be screened without downloading them from all sources and de-duplicating first. I’ve sometimes estimated the total number of included studies at the end of the project by screening a random sample (such as 100 citations) and calculating the ratio of the sample to the total number of citations to be screened (e.g. if there is one relevant article in a random sample of 100, and 1000 articles total to screen, I would estimate about 10 studies to be included at the end of the project – for more on getting a truly random sample of citations, see my previous blog post on this topic).

Tired of giving bad answers to this question, I’ve crunched the numbers for a few of the review projects I’ve worked on in the last year. For each of the projects, I found the number of citations downloaded from the Ovid MEDLINE search only, then the number of citations left to screen at the title/abstract stage after citations were downloaded from all databases and duplicates removed.

The results are below:

The ratio of MEDLINE search only to total citations to screen ranged from 239% to 1333%. However, the last two columns represent projects that had less of a biomedical focus (social sciences and computer science, respectively). The MEDLINE searches were still relevant in these cases, but we didn’t expect the majority of our studies to come from MEDLINE. Thus, if we exclude the major outlier, with more of a social sciences focus, the results are a little more consistent.

For each of the projects above, I searched 6-7 databases, except project 1, where I searched 14(?!). However, the ratio of citations for project 1 is not exceptionally different than that of the other projects. For now, I can’t see a discernible difference between screening burden and number of databases searched, but possibly more data is needed.

My overall take-away from this exercise is that, for the searches that I run, the screening burden of a systematic review tends to be about 2.5x to 5x that of the original MEDLINE search. In the future, this is the advice that I’ll be giving my researchers to help them better plan their resources and time. I can breathe a small sigh of relief, too, knowing that the information that I give my researchers is just a little more evidence-based than it was the day before.

Workbook for systematic review consultations

I’m often approached by masters and PhD students and researchers in my institution to advise on systematic review projects in the early stages. I’ve found that the skill levels to complete a systematic or scoping review are variable, and that many researchers need a primer to get up to speed about the process of conducting a review, what skills are required, and in particular, how to go about the planning process.

I support many projects in depth from start to finish, but for many projects at my institution, I only have the time to provide advice and consultations. Unfortunately, I quickly learned that throwing a lot of information at people in a short period of time was not useful, and I would sometimes see the same researchers at a later consultation who hadn’t gotten very far with their projects and needed a lot of the same information again.

Photo by Glenn Carstens-Peters on Unsplash

There are many, many resources online for conducting review projects, including some enviable LibGuides (I personally like the Queens University knowledge synthesis guide and University of Toronto learning to search guide). However, I wanted a resource that I could use when physically sitting with someone in a meeting room, where we could plan out their review project together. And I was getting pretty tired of drawing the same venn diagrams of how “AND” and “OR” boolean operators work on whatever scratch paper I had handy.

I recently developed a guide that fits these purposes, and after a few iterations and some testing and feedback, I’ve put it online for others to use and edit as they wish with a CC-NC-SA 4.0 License. The goal of this guide is to provide a resource that:

• Can be printed and used as a workbook to guide a systematic reviews consultation
• Also contains enough information to be a stand-alone self-learning resource for after the consultation (e.g. the information on boolean operators)
• Is not too long to be intimidating or overwhelming for someone just getting started

Without a doubt, there will be further refinements and additions to the guide over time, but for now, please feel free to download, use, and edit for your own purposes. Any feedback or comments are also gratefully accepted. 🙂

You can find the guide here at Open Science Framework.

Building a Twitter bot!

I have long admired – and, I’ll admit – been a bit fearful of cool technology projects that make use of APIs. To be honest, I’m still not *entirely* sure how an API works. It feels a bit like magic. You need keys and secret keys and bits of code and all those things need to be in the right place at the right time and I might even have to use scary things like the command line!

So you can imagine, I’ve been looking at all the cool Twitter bots launched over the past few years with much wistfulness… some examples of my favourites:

• Two-fisted Library Stories
• Nancy Drew books
• Magical Realism statements
• Harry Potter Sorting Hat statements
• Louis Theroux documentaries

When I recently saw Andrew Booth’s tweet about his “Random Review Label Generator”, I knew it was time for me to get in on the action.

Off to Huddersfield to Launch my New Random Review Label Generator – should keep at one high profile academic occupied for many years! pic.twitter.com/0hje64Mde2

— Andrew Booth (@AndrewB77877966) November 13, 2017

As it turns out, a lovely fellow has made the process of creating Twitter bots super easy by coding all the hard stuff and launching a user-friendly template with step-by-step instructions, freely available for anyone to use. Special thanks to Zach Whalen for creating and putting this online!

So: without further ado, I present to you a Twitter bot that randomly generates a new healthcare review project every hour. You’re welcome!

The beauty of this bot is that some of the project names are so ridiculous… any yet you wouldn’t be surprised to see many of them actually published. I am endlessly entertained by the combinations that it comes up with, and I hope you are too!

Tweets by yournextreview

Grey Lit Searching for Dummies

Ah, grey literature! Confronted with a vast void of faceless, nameless literature, it’s easy to quickly become overwhelmed. Where do I start? What do I search? What am I even looking for?

As a medical librarian, I’m used to structured searches in curated databases, and going into the unknown can be a frightening thought. However, it is possible to add structure to a grey literature search!

First: What are you looking for?

Too often, the idea of “grey literature” is lumped into one monolithic term. In reality, grey literature is a broad umbrella term and encompasses a lot of different document types whose main commonality is that they are unpublished or published outside traditional publishers: basically, anything that’s not a traditional published research article.

Think about the research project at hand and what types of literature would best support it. For example, in a qualitative synthesis or realist review of a social sciences topic, a lot of robust evidence might come from book chapters with unpublished studies. In a mapping review in health services research, government white papers/reports about local health initiatives might be most relevant. What do you expect the evidence to look like, and where might you go about finding it?

• Reports or white papers
• Theses and dissertations
• Book chapters
• Clinical trials registers
• Conference proceedings

Second: Make a plan!

Next, make a detailed plan for searching the literature. Your searching plan should contain information about what sources will be searched, how they will be searched, how the searches will be documented, and how/where the potentially relevant documents will be downloaded/stored.

Some strategies to consider including in your plan might be:

• Traditional database searches that will include grey lit such as conference abstracts (e.g. PyscINFO, Embase, Proquest Theses and Dissertations)
• Specialised databases (e.g. “grey” databases such as OpenGrey or HMIC, or small subject-specific databases without sophistocated search mechanisms)
• Search engines (e.g. Google, GoogleScholar, DuckDuckGo)
• Custom Google search engines (e.g. NGOs search, Just State Web Sites; Think Tank Search)
• Clinical Trials registers
• Hand searching of key subject websites (e.g. the main associations or government departments in that topic area)
• Consultation with experts (who may have ideas about papers you have missed)

For each strategy, document all the details you will need to conduct the search:

• Who is going to conduct the search?
• What search terms or search strategies will be used?

For more sophistocated sites, a full boolean strategy might be used, but for a site with a simple search box, perhaps one term or a few terms at a time might need to be used. Strategies should be similar, but adapted for the searching capabilities of that resource.

Think also about the context: if your search topic is “yoga for substance abuse”, and you’re searching the NIDA International Drug Abuse Research Abstract Database, you won’t need to include substance abuse terminology in your searches, because everything in that subject database is already about substance abuse.

• How will the searches be documented? Oftentimes, an excel spreadsheet will suffice with information such as the person searching, the date, the searching strategy, number of items looked at, and the number of items selected as potentially relevant. Bear in mind that for some resources, the searching strategy might be narrative, such as “clicked the research tab and browsed the list of publications”.
• How many results will you look at? The first 50? The first 100? Until there are diminishing returns?

Third: Execute the plan!

Make sure to have a strategy in place for recording your searches and downloading your citations. Due to the transient nature of the web, grey literature searches generally aren’t replicable. When you search google one week, and conduct the same search a year later, you might get different results. However, searches for grey literature can and should be transparent and well-documented, such that someone else could conduct the same searches at a later point, even if they would get different results.

For more information, check out the following:

Briscoe S. Web searching for systematic reviews: a case study of reporting standards in the UK Health Technology Assessment programme. BMC research notes. 2015 Apr 16;8(1):153.

Godin K, Stapleton J, Kirkpatrick SI, Hanning RM, Leatherdale ST. Applying systematic review search methods to the grey literature: a case study examining guidelines for school-based breakfast programs in Canada. Systematic reviews. 2015 Oct 22;4(1):138.

For a helpful list of grey literature sources to include in your search, also check out the Grey Matters tool published by the research information specialist team at CADTH.

Quick tip: use the Ovid multi-line launcher

In the “multi-line” vs “single line” searches debate, one point that is often thrown around is: multi-line searches are more cumbersome to edit and run. Even with Ovid’s new “edit” button, it still takes a few clicks and a few page refreshes to edit a strategy and see the results. When making lots of changes quickly to a strategy, this time can really add up.

One underappreciated and little known tool is Ovid’s mutli-line launcher. It’s beautiful! The multi-line launcher allows a user to copy/paste a multi-line strategy directly into the search box, press enter, and view the search results – with hits for each line – as normal.

screenshot of Ovid’s multi-line launcher tool

When making edits to a strategy I tend to do the following:

1. paste the strategy into the multi-line launcher box
2. ensure that the line numbers are still correct or changed if needed
3. press enter to view results
4. if strategy requires a change, type “..pg all” into the search box in the main Ovid MEDLINE interface to delete search history (see more about keyboard shortcuts in Ovid here)
5. Make edits to the strategy in a word document
6. Paste back into the multi-line launcher box

I’ve found this strategy works more quickly and with less site time-outs than using the native “edit” button.

Try it here: http://demo.ovid.com/demo/ovidsptools/launcher/launcher.html

How to convert a search between PubMed and Ovid

Have you ever tried to convert a search strategy from PubMed to Ovid or vice versa? It can be a real pain. The field codes in Ovid don’t always nicely match up with the tags in PubMed and it can be difficult to wrap your head around the auto-expode in PubMed vs manual explode in Ovid for indexing terms. Not to mention that there is some functionality that exists in Ovid but not PubMed (such as proximity operators) and in PubMed that doesn’t exist in Ovid (such as the supplementary concepts tag). Yikes!

Why would you want to convert a search strategy between the two, you ask? Don’t they have the same content?

1. There is some content that is in PubMed but not Ovid MEDLINE. The NLM factsheet “MEDLINE, PubMed, and PMC (PubMed Central): How are they different?” gives an overview of PubMed’s unique content.
2. You might want to use features that are available in both databases! Maybe you’re working on a strategy in Ovid MEDLINE, but realise partway through you’d really like to use one of the PubMed subject filters, for example.
3. Sometimes, you might find a search filter or hedge, but it is written in the syntax of a different interface. Translating a strategy isn’t always easy or intuitive, so automated the process can reduce errors and save time.

Over the past few months, I’ve been working with a colleague to build a tool that automatically converts searches between the two interfaces, and we recently presented our work at the EAHIL/ICML conference in Dublin.

EAHIL/ICML conference in Dublin

During the conference week, we had dozens of excellent conversations in person and on Twitter, and 138 unique website visitors! Thanks to everyone who provided feedback and suggestions for improvements. We are working hard to incorporate many of them over the coming months.

The tool is freely available at medlinetranspose.github.io. Please feel free to check it out and let us know how it works for you!

Finding a random set of citations in EndNote

Have you ever been asked to find a random set of citation from EndNote? This happens most often to me when researchers are testing out screening procedures, and want to ensure they are all interpreting the screening guidelines the same way. The researchers will all screen the same random set of 10-20 articles and compare results before screening the entire set.

So: what’s the best way to go about this? Sorting from a-z on any given field and selecting the top 10-20 articles isn’t likely to be truly random. For example, sorting by date will retrieve only very new or old articles. Sorting by record number is one possible way to do it, but also isn’t truly random as it will retrieve articles added to the database most or least recently.

Here’s how I take a truly random sample of citations from EndNote.

First, create an output filter in EndNote

The output filter will include only the citation record numbers. Don’t worry, you only have to do this once, and in the future it will all be set up for you!

1. In EndNote, go to Edit –> Output Styles –> New Style
2. In the resulting screen, click “templates” under the heading “bibliography”
3. Then, put your curser in the box below “generic”. Then, click “insert field” –> “Record Number” –> then press enter so that you curser goes to the next line in the text box.
4. Go to “file” –> “save as” and save it to something descriptive like “record-number-only”.

Next, export your record numbers.

1. Back in the main EndNote screen, click the dropdown box at the top of the screen, then “select another style”, and search for your previously created Output Style.
2. Then click “choose”. Ensure that your output style name is displaying in the dropdown box!
3. Select “all references” to make sure all your references (that you want to create a subset from) are displayed. Then click one of the references and press ctrl + a (or cmd + a on a mac) to select all references.
4. Right-hand click and select “copy formatted”.

Create your random subset!

1. Open excel, and press ctrl + v (or cmd + v on a mac) to paste all your record numbers.
2. in the cell to the right of your first record number, insert the formula =rand(). This will create a random number from 0 to 100.
3. Hover the cursor over the bottom-right corner of the cell until it makes a cross. Then click and drag all the way down to the last row that contains a record number
   Insert a row at the top and click “sort & filter” –> “filter” on the menu bar.
4. Then, sort the second row (with the random numbers) from smallest to largest (or largest to smallest).
5. You now have a randomly sorted list! Select and copy the top x number of cells in the first column (however large you want your sample to be).

Format your record numbers to put back into EndNote.

1. Paste your subset of record numbers into word (paste as text, not a table!)
2. Click “replace” on the main toolbar to bring up the find and replace box.
3. Beside the box “find what”, write ^p (the up-carrot symbol followed by “p”).
   Beside the box “replace with”, insert a semi-colon followed by one space.
4. Then click “replace all”.
5. You should have a string of record numbers separated by semi-colons.

Put them back into EndNote!

1. Go back to your EndNote Library.
2. Right-hand click in the sidebar and select “create smart group”
3. Give it a nice title, like “random set” 😃
4. In the first dropdown box, select “record number”, then “word begins with”, then paste in your formatted record numbers separated by semi-colons.
5. Click “create”.
6. All done!

I hope you found this useful. It might sound complicated, but this process really only takes a few seconds once you have gone through it a few times.

Do you have a more efficient or a different way of doing it? What kinds of formatting and database problems do you come across in your position? Feel free to send me a message or tweet at me.

Til next time,
Amanda

— POSTSCRIPT —

I was asked recently on Twitter how to isolate the remainder of citations for screening after using this method. It’s very easy!

creating a combination group in EndNote

To isolate the rest of your citations, simply make a combination group by doing the following:

1. First, create a new group in EndNote calls “All Refs”, and drag ALL your citations from the library into it by going to “All References”, selecting all by clicking ctrl/cmd + A, and dragging them into your new group.
2. Right-hand click on “My Groups” in EndNote, then click “Create From Groups”. Name this group “remainder to screen”, or something else that makes sense to you.
3. In the first drop-down menu, select your “All Refs” group.
4. Then select “NOT” from the boolean operators dropdown menu.
5. Then select the group that holds your random subset in the second dropdown menu.

using ovid faster and smarter

Did you know that Ovid’s search bar can be used like a command line? Its most common use is to type in search queries, but it can also be used to execute several time-saving commands.

Each command is preceded by two dots (..). These are what tell the database that you don’t want to search for terms, but do something different. Remember that there is no space between the two dots (..) and the command!

Part 1: Save and execute searches

• ..sv ps(search name) will save your search permanently. For example, “..sv ps(Heart-Disease)” (without the quotes) to save the current search. The parenthesis are important — without them, the search will only be saved temporarily (24 hours). I like to periodically type in the same command above while working to save any updates to the search that I’m working on.
• ..e <saved search name> will execute a search. For example, if you have a saved search called Heart-Disease, type “..e Heart-Disease” (without the quotes) to execute the search.
• ..pg all to clear the search history. If your search is saved, it will stay saved, but this allows you to clear the slate and start something new. Similarly, use “.. pg #,#” (without the quotes) to purge specific lines.
• ..dedup # to remove any duplicates from a specific line in the search history.
• ..ps to view the entire search history in a printable format

Part 2: Look up information about MeSH

• ..scope <subject heading> will look up the scope note for the indicated subject heading. For example “..scope heart diseases” (without the quotes).
• ..tree <subject heading> will look up the subject heading in the tree hierarchy. For example, “..tree heart diseases” (without the quotes).
• ..sh <subject heading> to look up the subheading selection window for the subject heading.

(Note: The three commands above can be used with out without the dot dot (..) syntax preceding the command. I like to use it for all commands for consistency).

All of this information is also contained in Ovid’s help documentation.

I hope you find these commands as useful as I do. If you can master these, you’ll be well on your way to becoming a database master (and also wow those around you with you efficient navigating ability!).

Til next time,

Amanda

 

Using a “gold standard” set to test your search

When developing a systematic search, it’s important to use an iterative approach, constantly tweaking and reevaluating your strategy to ensure relevant articles are captured (and hopefully, non-relevant articles are minimised).

Today, I’d like to share a trick that I frequently use when building my searches. First, develop a set of articles which are relevant to your topic. These are articles which should definitely be picked up by your search. The articles might come from researchers or your patrons, other team members on the systematic review, background scoping searches, google scholar, or any other number of places. The more variety in the set of articles, the better. These articles will comprise your “gold standard set” by which you will test your search strategy.

PART 1: Formatting your PMIDs

First, put each of these articles into your citation management system (ideally EndNote). Next, ensure that each article contains a PMID (PubMed ID) in the accession number field (or whichever one you choose). In EndNote, this can often be easily done by clicking “references”, then “find reference updates”. However, do check through all the citations for any that are missed; it may be necessary to manually find the PMID in PubMed.

After you have your gold set all tidied up in EndNote, export the set of references using a custom output filter containing only the accession number field. To set this up in EndNote v7 (only required the first time you do this!):

1. go to Edit -> Output Styles -> New Style.
2. in the sidebar, find “Bibliography” heading and click the “Templates” subheading.
3. in the box that says “Generic”, click “Insert Field”, then “Accession Number”. Save and close your output filter with a descriptive name such as “PMID”.

To export the references using your new filter, first make sure that your newly created output filter is selected (the name should appear in the dropdown box on the top header; if not select the dropdown box, then “select another style”). Next, press ctrl + A to select all references, then right-hand click and select “copy formatted”.

Open a word document and press ctrl + v to paste your formatted references. Your document ought to contain a list of PMIDs – one per line. From here, I use the find and replace tool to automatically format the list of PMIDs for Ovid Medline:

1. Click “find and replace”.
2. In the “find what” box, enter ^p (this stands for the paragraph character)
3. In the “replace with box”, enter “_OR_” (the underscores represent spaces)
4. Press “Replace all”.

Okay! Still with me? Your word document should be formatted most of the way. Now, I finish by adding an open parenthesis at the beginning of the document and replacing the final ” OR sequence with ).ui. The .ui at the end refers to the Ovid Medline field code for accession number (where the PMID is stored). The text of your document should now look something like this:

(“19901971” OR “22214755” OR “22214756” OR “24169943” OR “24311990” OR “18794216” OR “25491195” OR “16931779” OR “9727760” OR “22529271” OR “18757621” OR “25536072” OR “24838102” OR “25025477” OR “23460252” OR “26888209” OR “24381228” OR “25154608” OR “21889426” OR “24165853” OR “25315132” OR “26819213” OR “26936902” OR “27492817” OR “27531721” OR “27522246” OR “27067893”).ui

This process might take a little while to set up the first time, but once everything is automated through your custom output file, it will only take a few seconds in the future. I’m a big fan of front-loading my work to make things easier down the line.

PART 2: Testing your gold standard set

Now, navigate to your draft search strategy in Ovid Medline and paste the full query from part 1 into a new line below the search.

Take the line of your final search results and the line containing your gold standard set and OR them together. If the last two lines in Ovid contain the same number, you’re in luck! All the citations in your gold standard set will be picked up in your draft search. If not, NOT out your original search results to see which ones have been missed; by looking at these citations, you can strategise ways to pick up articles with similar wording or indexing.

OR together your “gold standard” set with your final search results. If the number stays the same, all your gold standard articles are contained in the search strategy.

I sometimes find that researchers are concerned about whether the relevant articles they have found will be captured by my search strategies, so I sometimes include this “gold standard search” in draft strategies that I send. I also annotate my process to make it more clear.

The beauty of this method is that as new relevant papers are discovered from additional sources, you can add them to the gold standard set, and continually check your strategy throughout the drafting process.