"Examining the Impact of the National Institutes of Health Public Access Policy on the Citation Rates of Journal Articles"Posted in Open Access, Publishing, Scholarly Journals, Scholarly Metrics on November 16th, 2015
Sandra L. De Groote et al. have published "Examining the Impact of the National Institutes of Health Public Access Policy on the Citation Rates of Journal Articles" in PLoS One.
Here's an excerpt:
To examine whether National Institutes of Health (NIH) funded articles that were archived in PubMed Central (PMC) after the release of the 2008 NIH Public Access Policy show greater scholarly impact than comparable articles not archived in PMC. . . .
A total of 45,716 articles were examined, including 7,960 with NIH-funding. An analysis of the number of times these articles were cited found that NIH-funded 2006 articles in PMC were not cited significantly more than NIH-funded non-PMC articles. However, 2009 NIH funded articles in PMC were cited 26% more than 2009 NIH funded articles not in PMC, 5 years after publication. This result is highly significant even after controlling for journal (as a proxy of article quality and topic).