In June 2011, the impact factors of the main journals were announced for the year 2010. These data can be found at
http://isiknowledge.com/jcr (
access limited to subscribers only). As previously indicated in this journal [
1‐
3], the impact factor in a specific year consists of the average number of citations of publications in the previous two years divided by the number of publications (citable items) in these two years. Consequently, the impact factor of NHJ 2010 is the number of citations to NHJ articles published in 2008 and 2009, divided by the number of citable NHJ articles published in 2008 and 2009. The total number of citations over 2008 and 2009 was 191 (2008: 118 citations, 2009: 72 citations), whereas the total number of citable articles in this period was 132 (2008: 64, 2009: 68). As a result, the 2010 NHJ impact factor was calculated as 191/132 = 1.447 (almost 1.5). Although this is just a small step forward compared with the 2009 impact factor (1.392), it is still a significant achievement for a national journal that has only been listed by PubMed since January 2007 [
4,
5]. It is encouraging to observe that the number of citations is steadily increasing over time (1 citation in 2007, 58 in 2008, 200 in 2009, 288 in 2010, and halfway through 2011 already 238 citations). At the same time, the number of citable items per year has remained fairly constant over the years, varying from 61 to 68, at least suggesting improvement in impact factor in the forthcoming years. …
