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What proportion of journal articles are OA and to what extent do researchers post OA copies in repositories?
We compared the proportion of journal articles, meeting articles and meeting abstracts contained in the six databases.
The proportion of journal articles contained within each of the six databases ranged from 96 to 97%; results were similar for meeting articles.
This higher proportion of journal articles coming from primary research may be because journals consider primary research more newsworthy than reviews of already published evidence.
However there was a significant correlation between impact factor and the proportion of journal articles accounting for the bulk of the citations for both surgical and immunology journals.
The proportion of journal articles contained within the holdings of each of the six databases were similar, ranging from 96 to 97%; content coverage did not differ between the subscription-free databases and the subscription-based databases (P = 0.6).
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Proportion of journals providing advice about trial registration and proportion of trials registered.
The proportion of journals studied was very low in relation to the total number of journals published.
It is possible that a large proportion of journals that have a higher impact factor have made initiatives to have authors submitting RCT manuscripts to their journal to adhere to the CONSORT statement.
7 We wanted to discover what proportion of journals require trial registration as a condition for publication, or encourage it without making it mandatory, and why they choose to do this.
MEDLINE indexes over 4000 journals and this number is still a relatively small proportion of all journals that deal with health care.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com