Impact factors 2015; NHJ on the rise!
نویسنده
چکیده
In June 2016, the impact factors for the year 2015 were released (Thomson Reuters Journal Citation Reports® JCR 2015, ISI Web of Knowledge). The 2015 impact factor of the Netherlands Heart Journal (NHJ) amounted to 2.062, showing a clear rise compared with the 2014 impact factor (1.837). The impact factor is defined as the average number of citations received per paper divided by the published articles in a specific journal during the preceding two years [1, 2, 3]. The 2015 NHJ impact factor was calculated as follows: in 2015 the total number of citations to articles published together in the years 2013 and 2014 amounted 301. The total number of articles published together in 2013 and 2014 was 132. As a result, the 2015 impact factor was 301 citations divided by 132 articles: 301/132 = 2.062. NHJ received its first impact factor in 2009, which was 1.392 at that time; it increased to 2.263 in 2013, decreased in 2014 but now appears to be back on track again with 2.062 [4, 5]. How does NHJ stand internationally? Out of a total number of 124 JCR-listed cardiovascular journals (subject category Cardiac & Cardiovascular Systems) NHJ takes place 68 on the list of impact factors for 2015, being therefore in the midrange. This can be considered to be rather good for a national journal from a relatively small country. As is well known, the top-3 cardiovascular journals – already for quite some years now – are the Journal of the American College of Cardiology (JACC), Circulation, and the European Heart Journal (EHJ). The 2015 impact factor for JACC was 17.759, for Circulation 17.047, and for EHJ
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