It is best practice to search using both subject headings and keywords. To develop your keyword search, you need to follow the three steps below:
Academic authors can use a variety of terms when describing the same idea, so it is important that you include all relevant words in your search strategy - databases will only yield results that match what you enter!
Consider:
In your PCC breakdown, you would have identified the relevant alternative keywords.
For example:
PCC | Term | Keywords | MeSH |
Participants |
NA |
- |
- |
Concept |
Chronic disease |
chronic disease chronic illness noncommunicable noninfectious disease |
Chronic disease/ |
Nurse-led care models |
nurse-led, nursing led |
Practice patterns, |
|
Context |
High income countries |
first world countries, |
Developed countries/ |
Each separate element will become a keyword line in your search strategy.
Next, you need to combine your keywords with the connectors AND and OR.
connects alternative keywords within a concept to broaden your search. |
|
connects different concepts to narrow your search. |
|
removes terms. Avoid using NOT as it can remove relevant results. |
The video (3:11) below provides more information:
For our example:
Chronic disease OR chronically diseased OR chronically ill OR chronic illness OR non-communicable disease OR noncommunicable disease OR non-infectious disease OR noninfectious disease
|
Chronic disease OR chronically diseased OR chronically ill OR chronic illness OR non-communicable disease OR noncommunicable disease OR non-infectious disease OR noninfectious disease
AND Nurse-led OR nursing led OR nurse run OR nursing run OR nurse managed OR nurse practice patterns AND 1st world countries OR developed nations OR industrialised nations |
Truncation - Most databases allow you to find word variations by using a feature called truncation. Use a symbol, often the asterisk * (select shift 8 on your keyboard), to substitute for characters after a word stem.
It is highly recommended you use truncation to include all variations of a word in your search.
e.g. nurs* finds nurse, nurses, nursed, nursing
Limited truncation - allows you to specify how many letters you want to find after a root word. This is only available in some databases, for example MEDLINE, Embase and PsycINFO.
e.g. nurse$1 finds nurse or nurses or nursed, but NOT nursing
Wildcards - allow you to find different word spellings. The symbol will find one character, or no character only. The wildcard symbol can vary between different databases, so always check the help screens.
e.g. p?ediatric finds pediatric or paediatric
organi?ation finds organisation or organization
Phrase searching searches for an exact match for your keywords. Most databases require you put phrases in double quotes to search for phrases.
e.g. "nurse-led models"
The one exception is Ovid databases (for example: MEDLINE, Embase, PsycINFO). Ovid only requires double quotes when your phrase contains a preposition.
e.g. "practice patterns of nurses"
Note: Cut/copy and paste from Word documents can cause issues due to code. You may find it best to use a plain text editor. In some cases (e.g. double quotation marks) you may need to manually type in elements of your search.
For our example:​
"chronic* disease*" OR "chronic* ill*" OR "non?communicable disease*" OR "non?infectious disease*"
AND nurse-led OR "nursing led" OR "nurs* run" OR "nurse managed" OR "nurse practice pattern*" AND "1st world countr*" OR "first world countr*" OR "developed nation*" OR "industriali?ed nation*" |
Database records contain descriptive information about publications organised into searchable sections called 'fields'. Targeting your search to specific fields can be a powerful tool when designing your search strategy.
By default, most databases will search for the terms you enter in a variety of fields. For example, in Ovid MEDLINE you will see
mp. [mp=title, abstract, original title, name of substance word, subject heading word, floating sub-heading word, keyword heading word, organism supplementary concept word, protocol supplementary concept word, rare disease supplementary concept word, unique identifier, synonyms]
Here, mp stands for 'multi-purpose'.
You may be able to improve the relevancy of your results by searching for terms in specific fields.
Recent change (Sept 2021): Embase and Emcare now align with MEDLINE with .kf for author supplied keywords
Commonly used fields for systematic reviews: databases available via Ovid (selection)
Database | Title | Abstract | Author supplied keyword | Textword - combined fields |
MEDLINE | .ti | .ab | .kf | .tw (includes Title and Abstract) |
Embase | .ti | .ab | .kf | .tw (includes Title, Abstract, and Drug Trade Name) |
Emcare | .ti | .ab | .kf | n/a |
PsycInfo | .ti | .ab | n/a | .tw (includes Table of Contents, Title, Abstract and Key Concepts) |
How to use field codes - example searches:
chronic pain.tw
(chronic pain OR recur* pain).tw - use brackets when combining terms
(chronic pain OR recur* pain).ti,ab. - use a comma to combine fields
For a full breakdown of all available fields within any Ovid database click the 'i' icon to the left of the database name which will take you to the Field Guide for your selected database:
When developing a comprehensive list of keywords, the following tools may be useful to explore: