This site will provide you with information and resources on how to search and find scientific articles and other materials for research and studies in the field of health sciences. The library will also assist you in your work with systematic reviews of various kinds.
Empirical studies contain original research. They contain a thesis or interpretation supported by relevant data.
(Narrative) Literature review
Literature reviews survey and analyze a clearly delaminated body of scholarly literature. There is no systematic search required and the celection of scientific articles is supportive of the research question.
Systematic review
Maps and summarizes research articles on an entire subject area within a field of research.
Scoping review
Maps and summarizes knowledge about a field, often within emerging topics. The material does not necessarily have to be limited to research articles.
Metaanalysis
Maps out theories and knowledge within a field, focusing on knowledge summaries.
Preparing your search by formulating a clear, well-defined, and answerable search question
Usually, the basic literature search process starts with formulating a clear, well-defined research question. Creating a clear and precise research question is essential to creating an effective search string. To ensure the best results from a literature search, your research question(s) must be well-defined and answerable. If the question is too broad, your search will yield more information than you can possibly look through. If it is a too narrow question, you might end up with no or too few results.
Create a Search Chart
Search charts serve as frameworks for developing a research question that is searchable. This tool helps you develop a well-defined and focused question that can be addressed through literature. By using search charts, you can pinpoint the key concepts in your research question, making it easier to identify terms for systematic searching in databases. Keep in mind that selecting a search chart that fits your research question might not always be straightforward. Nevertheless, the primary objective is to clarify the essential concepts in your research question and break it down so that you can extract the terms you’ll use in your search.
Overview over different search charts:
Variiation of PICO:
PICO+ (adds (+) concept, patient values or preferances)
PICOT (adds Time)
PICOS (adds Study type)
PICOC (adds til Context)
SPIDER:
This chart is useful for qualitative research questions related to attitudes, experiences, or expertise. SPIDER has a greater emphasis on the phenomenon being investigated rather than the intervention. A key distinction between SPIDER and other search charts lies in its use of Design OR Evaluation as a search criteria, rather than the common AND employed by other search charts. This approach helps reducing the risk of extremely limited or zero results.
(S) AND (PI) AND (D OR E) AND (R)
Research Question:
«Which experiences regarding peer support do hospital nurses have?”
(S) Nurses, hospital
(PI) Peer support
(D) interview
(E) experiences
(R) qualitative
In the given example, we are seeking qualitative primary studies where interviews have been conducted.
There are additional types of search charts available, and it’s advisable to select a form that aligns with your chosen research method.
For conducting your search, you will need to consult a variety of resources to find information on your topic. While some of these resources will overlap, each also contains unique information that you won’t find in other databases.
The three of our most common databases for health sciences are: Embase, Medline, and Cinahl. They are always important to search in because they contain large numbers of citations and have a fairly broad scope. However, you must always evaluate which database suits your research question most.
Finding Search Terms – Searching with Subject Headings and Text Words
In databases references are tagged with standardized keywords from a list. You need to search for literature using the relevant keywords as search terms. These search terms are called subject headings. If you want to make your search more specific and accurate, you must use the controlled vocabulary, that describes the main themes in an article, within databases. A controlled vocabulary is a standardized hierarchical system. For example, PubMed uses Medical Subject Headings (MeSH terms) to “map” keywords to the controlled vocabulary. Embase’s controlled vocabulary is called Emtree, and CINAHL’s controlled vocabulary is called CINAHL Headings. Consider focusing the controlled vocabulary as the major topic when using MeSH, Emtree, or CINAHL Headings. Not all databases use a controlled vocabulary.
In a list of subject headings, there is one selected subject heading for each concept.
Example: In Medline, the subject heading for stroke is ‘Ischemic Attack, Transient,’ and references related to strokes should be tagged with this term. By searching for the subject heading ‘Ischemic Attack, Transient,’ we also retrieve articles where authors have chosen to use synonyms such as TIA, cerebral ischemia, transient, or brain TIA.
IMPORTANT! As mentioned before, not all databases have subject headings. Different databases may have different subject headings. There are no subject headings for everything, and indexing (labeling) can be incomplete.
What should you do if the research field is underexplored, new, or there are no subject headings for the field you are searching for?
Conduct a search with text words!
With a text word search or free-text-search, you will search within all text for the keywords you enter. In reference databases, this usually means that we do not search the entire document or article but focus on the title, abstract, and other available information about the document. Use the text word that you’ve identified from your search chart to start searching. You might start your search broadly, with just a few key words, and then add more once you see the scope of the literature. If the preliminary search doesn't produce many results, you can play with removing some key words and adding more specific detail.
To find suitable search terms the following can be to an advantage:
- find synonyms
- check which words are used in subject- and research literature-slå opp i ordbøker
- check keywords on scientific articles you already have at hand
Preliminary Searches to gain an Overview
Why you should conduct a preliminary search
It’s essential to gain an overview of the existing research related to your topic before choosing a type of study design
It will help you to identify relevant search terms for further searches
Enhances your understanding of the chosen subject
Provides insight into the volume of existing research on the topic
Perhaps your research question needs refinement or another focus?
NOTE! If you’re conducting a meta-analysis or systematic review, you’ll want to know if someone has already addressed your research question. In that case, you’ll need to assess whether it’s appropriate to proceed with the same question.
The most important search technique involves using boolean operators. We distinguish between the operators “OR” to combine synonyms or alternative terms, thereby increasing the number of hits. The goal is to ensure that at least one of the terms is mentioned in an article. The other operator is “AND” which combines search terms that represent different aspects of a research question. The “AND” operator ensures that only the most specific articles are included in the search results. Consequently, you’ll get fewer hits, but they will be the most relevant based on the search terms.
Synonyms are combined with “OR” must often be grouped within parenthesises in search fields. AND connects different parenthesises. Additionally, it is possible to use a third boolean operator: NOT which excludes certain search terms. Be aware that you might accidentally oversee or exclude articles which are relevant, but since the excluded term was mentioned in an article it won’t show up in the results. Therefore, be cautious using NOT.
Example:
“High infectious deseaces” NOT COVID-19
Nurses NOT doctors.
For more complex searches, you can structure them as follows.
Remember to group synonyms with parentheses before combining them with “AND.” This way, the database will understand that it should first combine all terms with “OR” before further combining them with “AND.”
Here are some examples:
nurses AND “peer support”
nurse OR nurses OR "nurses, hospital”
(nurse OR nurses) AND ("peer counseling" OR "peer support" OR "peer guiding") AND (interviews OR "qualitative research")
Phrase Searches
If you want specific words to appear in a particular order, enclose them in quotation marks. This is important because some databases treat spaces between search terms as “AND”-operators (e.g., eating disorders => eating AND disorders). To avoid an incorrect number of hits, use quotation marks to search for multiple words together as a phrase. For instance:
“eating disorders”
“early mobilization”
“quality of life”
Truncation
When a word has various endings, you can search for all variations by adding an asterisk (*). Start with the beginning of the word and add *. For example, searching for "vaccin*" will yield hits for vaccine, vaccines, vaccination, and vaccinated.
Searching with phrases
Most databases provide a range of options to refine and filter search results. In some databases, these features are called ‘limits’ or ‘refine results.’ Different databases may employ varying methods for narrowing down search results. Common criteria include publication year, patient age group, publication type, and language. Clinical Queries offer filters to focus on specific research methods or core questions. For example, in CINAHL, these categories encompass Therapy, Prognosis, Review, Study Designs, and Causation (Etiology).
Systematic searches are conducted across various types of databases. The knowledge base is acquired through a literature search performed systematically, transparently, and in a repeatable manner. Consequently, thorough documentation of the process becomes especially crucial. Different types of systematic reviews encompass:
Narrative litterature review
Broad, selective choices of existing literature
The analysis can be chronological, conceptual, or thematic
Often, this type of literature study lacks specific inclusion criteria and search strategies
Greater risk of bias
Usually not exhaustive in its overview of the literature
Integrative review/Metasynthesi
Similar to a systematic review, but more comprehensive and holistic in its scope
Gathers studies with diverse empirical evidence, methodologies, and theories
Employs clear and explicit inclusion criteria, search strategy, extraction, and analysis process"
Scoping review
Gathers a substantial volume of literature related to a specific subject area, where not all content necessarily undergoes rigorous quality assessment aka peer review
Serves as a preliminary study for a systematic review
Does not adhere to rigid analytical protocols
Umbrella review
Collects published systematic reviews and meta-analyses
Rapid review
Similar to a systematic reviews, rapid reviews are conducted within a shorter timeframe and target a more specific research question.
Ensuring high-quality execution can be more demanding.
After choosing the best suited type of review, you can develop a search strategy.
The search process as such always starts with defining inclusion- and exclusion criteria. Then create your search chart before choosing and conducting your search. The major and most important difference between systematic searches and literature searches for background literature is that systematic reviews demand a high level and thorough documentation of your search process. The documentation is necessary to ensure higher quality, transparency and reproducibility of your study.
How to document your seaches for reviews
You must always document your research process, when and where you have conducted a search-string and which search terms you have selected and why. This will ensure the required transparency, quality assessment and the reproductivity of your search. Once you have done a search and selected documents, you should copy your search history or write down what you have done. The re-construction of a search-string later on in the work progress is impossible. Even the library cannot assist you with re-constructing your searches and results, because we cannot be sure what you’ve done previously. Additionally, it would not be ethically correct. If you document all your work correctly and extensively, it will be easier for the library to assist you when you want to update a search-string for further research.
Forms and charts that might help you to document your searches:
The library has access to many databases that give you access to literature in the field of health.
In Oria, you will find an overview of databases relevant in nursing, health sciences, substance abuse, and mental health. Some of the databases are openly available, but you need library remote access.