If you want to do a systematic search, combining lots of different keywords, use subject headings and limits, you should use Ovid’s advanced search options.
Advanced search is available as a tab on the same screen as the basic search that has already been covered, click on Advanced Search
to see them:
The best way to use Ovid is to split your research question into keywords or phrases. You can use PICO (Patient Intervention Comparison Outcome) to help you to refine your research question and organise your search terms. When planning search terms you should also think about synonyms fpr them, as this will help you retrieve more relevant content.
It is often easiest to search for one keyword at a time. Ovid displays the results of each search line-by-line in your search history. You can then use these to build a stronger, more flexible search. This also allows you to spot weak links
more easily, e.g. if one aspect of your search yields fewer results than you might expect.
So, for the research question fires in operating theatres caused by alcohol skin preparations
, you could use the following search lines:
fireand all its synonyms
Operating theatresand all synonyms
Alcohol preparationsand all synonyms.
The Search History
box allows you to combine the different searches:
You can combine searches using ANDOR (also known as Boolean operators).
fire OR operating theatres, you would be given those articles containing the word
fire, those containing
operating theatresand those with both words in them.
fire AND operating theatres AND alcohol preparation(search lines 1-3 above). This would only produce results where all the search phrases are included in the article, cutting the number of results.
The following diagram may help to explain AND / OR:
fireOR
operating theatrewould retrieve results from both the blue circle and the red circle, including the overlapping section.
fireAND
operating theatrewould only retrieve results from the overlapping section of the two circles, cutting down the number of results.
On the advanced search form, type your keyword into the search box and click Search
:
Using the buttons above the search box, you can search for your terms as keywords, in the author field, in the article title or in the title of a journal. You can use the Expand Term Finder
tool to help you locate additional suitable search terms.
Optionally, check Map Term to Subject Heading
if you want your search to use subject heading systems, such as MeSH and EMTREE. In this case, Search
will take you to a list of subject headings that most closely match the term you typed into the search box. Select the headings that match your topic of interest by ticking the relevant heading and then click Continue
:
Subject headings are assigned to each individual record in Ovid, helping the searcher to find relevant journal articles with more precision. However, articles may take up to 6 months to be given their subject headings, so they should be used in conjunction with other search terms in order to retrieve all relevant content.
Select– search for articles indexed with this heading.
Explode– subject headings are hierarchical, so there may be more focused
sub-headingsof relevance to your search, clicking on the subject heading itself will show the sub-headings.
Focus– the article has been classified as having this subject heading as its main focus, this can be useful but should be used with caution as an article can still be interesting even if the subject is not its
focus.
Scope– the
scope notefor the heading will appear, this explains how it is used, sometimes you may get similar looking headings and this can help you to choose the most appropriate one.
Operating theatres.mp(not highlighted in blue) – Ovid will search for articles with the subject headings you’ve selected, AND any journal articles with the words
operating theatresin them. This can be useful to get more relevant search results, but don’t forget your synonyms.
Before hitting Continue
ensure that you have kept the combine selections with
option on OR
otherwise you will retrieve far fewer results.
The results of your search will be displayed. Once you’ve completed searches for all your keywords, you can combine searches in Search History: click Search History
to expand the box:
Click in the boxes to the left of the numbers to select searches to combine, then click and
or or
. Your combined search results will appear in a new line (see search 4 above).
Click Display Results
on the right hand side of the page to look at the results for any query.
On your results list, clicking Abstract
under View
will show you the citation information plus the abstract:
You can select individual records by ticking the box next to their number, then you can print, email, export (as a Word document) or “Add to My Projects” (to add the individual article reference to your Ovid account).
It can also be useful to look in the individual records to see which subject headings have been used to help structure or refine your search strategy:
General library enquiries, including research enquiries:
library@rcseng.ac.uk 020 7869 6555
Online journal and resource enquiries:
library.athens@rcseng.ac.uk 020 7869 6556
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