2007 Journal Impact Factors for leading medical and science journals (2006 citation data)

2007 Impact Factors for leading medical and science journals
(newly released for journal citation data in 2006)
(Source: ISI Journal Citation Reports impact factors tabulated from each journal's public website)

General (internal) medicine

1. New England Journal of Medicine 51.3
2. Nature Medicine 28.6
3. The Lancet 25.8
4. Journal of the American Medical Association (JAMA) 23.2
5. Annals of Internal Medicine 14.8
6. Public Library of Science (PLOS) Medicine 13.8
7. British Medical Journal (BMJ) 9.2
8. Archives of Internal Medicine 7.9
9. Canadian Medical Association Journal 6.9
10. Medicine 5.2

Basic Science and Biology

1. Science 30.0
2. Cell 29.2
3. Nature Immunology 27.6
4. Nature 26.7
5. Nature Genetics 24.2
6. Nature Materials 19.2
7. Nature Cell Biology 18.5
8. Immunity 18.3
9. J Clinical Investigation 15.8
10. PLOS Biology 14.1
11. Molecular Cell 14.0
12. Developmental Cell 13.5
13. J Cell Biology 10.2
14. PNAS 9.6

(note: review journals are not included)

Old 2006 impact factor rankings (using 2005 journal citation data)