Purpose: To analyze the aggregate impact factor (AIF) in ophthalmology, its inflation rate, and its relation to other subject fields. Methods: A retrospective, database review of all subject fields in the Journal Citation Reports (JCR), Science edition. Citation data, AIF, number of journals and citations from the years 2003–2011 were analyzed. Data were retrieved from JCR. Future trends were calculated using a linear regression method. Results: The AIF varies considerably between subjects. It shows also an inflation rate, which varies annually. The AIF inflation rate in ophthalmology was not as high as the background AIF inflation rate. Conclusions: The AIF inflation rate caused the AIF to increase annually. Not considering these variations in the AIF between years and between fields will make the AIF as a bibliometric tool inappropriate.

Keywords:
Impact factor, Aggregate impact factor, Citations
1.
Garfield E: Citation analysis as a tool in journal evaluation. Science 1972;178:471–479.
2.
Moed HF, van Leeuwen TN: Impact factors can mislead. Nature 1996;381:186.
3.
Neff BD, Olden JD: Not so fast: inflation in impact factors contributes to apparent improvements in journal quality. BioScience 2010;60:455–459.
4.
Althouse BM, West JD, Bergstrom T, Bergstrom CT: Differences in impact factor across fields and over time. J Am Soc Inf Sci Technol 2009;60:27–34.
5.
Biglu MH: The influence of references per paper in the SCI to Impact Factors and the Matthew Effect. Scientometrics 2008;74:453–470.
6.
Antelman K: Do open-access articles have a greater research impact? Coll Res Libr 2004;65:372–382.
7.
Wilson AE: Journal impact factors are inflated. BioScience 2007;57:550–551.
8.
Seglen PO: Citations and journal impact factors: questionable indicators of research quality. Allergy 1997;52:1050–1056.
9.
Seglen PO: Why the impact factor of journals should not be used for evaluating research. BMJ 1997;314:498–502.
10.
Kumar A, Cheeseman R, Durnian JM: Subspecialization of the ophthalmic literature: a review of the publishing trends of the top general, clinical ophthalmic journals. Ophthalmology 2011;118:1211–1214.
11.
Smith JM, Steel DH: Anti-vascular endothelial growth factor for prevention of postoperative vitreous cavity haemorrhage after vitrectomy for proliferative diabetic retinopathy. Cochrane Database Syst Rev 2011; CD008214.
12.
Boscia F: Current approaches to the management of diabetic retinopathy and diabetic macular oedema. Drugs 2010;70:2171–2200.
13.
Hemmingsson A, Mygind T, Skjennald A, Edgren J: Manipulation of impact factors by editors of scientific journals. AJR Am J Roentgenol 2002;178:767.
14.
Epstein D: Impact factor manipulation. The Journal of the European Medical Writers Association 2007;16:133–134.
15.
Falagas ME, Alexiou VG: The top-ten in journal impact factor manipulation. Arch Immunol Ther Exp (Warsz) 2008;56:223–226.
16.
Larivière V, Gingras Y: The impact factor’s Matthew Effect: a natural experiment in bibliometrics. J Am Soc Inf Sci Technol 2010;61:424–427.
17.
Lawrence S: Free online availability substantially increases a paper’s impact. Nature 2001;411:521.
18.
Brody T, Stamerjohanns H, Harnad S, Gingras Y, Vallieres F, Oppenheim C: The effect of open access on citation impact. National policies on open access (OA) provision for university research output: an international meeting. Southampton University, Southampton, UK, 2004.
19.
Eysenbach G: Citation advantage of open access articles. PLoS Biol 2006;4:e157.
20.
Neylon C, Wu S: Article-level metrics and the evolution of scientific impact. PLoS Biol 2009;7:e1000242.
21.
Eysenbach G: Can tweets predict citations? Metrics of social impact based on twitter and correlation with traditional metrics of scientific impact. J Med Internet Res 2011;13:e123.
© 2012 S. Karger AG, Basel
2012
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