What are the variables associated with Altmetric scores? – An overview of methodological reviews (Preprint)
BACKGROUND The most common way to assess the impact of an article is based upon the number of citations. However, the number of citations do not precisely reflect if the message of the paper is reaching a wider audience. Currently, social media has been used to disseminate contents of scientific articles. In order to measure this type of impact a new tool named Altmetric was created. Altmetric aims to quantify the impact of each article through the media online. OBJECTIVE This overview of methodological reviews aims to describe the associations between the publishing journal and the publishing articles variables with Altmetric scores. METHODS Search strategies on MEDLINE, EMBASE, CINAHL, CENTRAL and Cochrane Library including publications since the inception until July 2018 were conducted. We extracted data related to the publishing trial and the publishing journal associated with Altmetric scores. RESULTS A total of 11 studies were considered eligible. These studies summarized a total of 565,352 articles. The variables citation counts, journal impact factor, access counts (i.e. considered as the sum of HTML views and PDF downloads), papers published as open access and press release generated by the publishing journal were associated with Altmetric scores. The magnitudes of these correlations ranged from weak to moderate. CONCLUSIONS Citation counts and journal impact factor are the most common associators of high Altmetric scores. Other variables such as access counts, papers published in open access journals and the use of press releases are also likely to influence online media attention. CLINICALTRIAL N/A