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FIELD RANKINGS FOR ENGLAND, 1999-2009, BY RELATIVE CITATION IMPACT

Rank Field Papers Citations Citations/ Paper World Cites/Paper % +/- 1 Plant/Animal Sciences 31,721 401,900 12.67 7.49 +69 2 Agricultural Sciences 7,991 87,009 10.89 6.73 +62 3 Environment/Ecology 17,766 277,739 15.63 10.70 +46 4 Geosciences 24,949 339,719 13.62 9.39 +45 5 Physics 52,050 656,729 12.62 8.82 +43 6 Materials Science 21,341 193,494 9.07 6.44 +41 6 Pharmacology 11,403 189,787 16.64 11.80 +41 8 Space Science 16,669 327,353 19.64 14.10 +39 9 Chemistry 56,953 820,008 14.40 10.61 +36 9 Microbiology 12,292 259,900 21.14 15.60 +36 11 Mathematics 12,676 56,871 4.49 3.34 +34 12 Molecular Biology 24,909 847,005 34.00 25.63 +33 12 Neurosciences 25,039 632,792 25.27 19.07 +33 14 Biochemistry 40,556 902,175 22.25 17.04 +31 15 Clinical Medicine 173,583 2,775,378 15.99 12.63 +27 16 Computer Science 16,354 71,203 4.35 3.45 +26 17 Engineering 47,692 255,746 5.36 4.43 +21 18 Psychiatry/Psychology 25,665 326,113 12.71 10.74 +18 19 Immunology 11,505 270,711 23.53 21.50 + 9 19 Economics/Business 18,627 116,211 6.24 5.72 + 9 SOURCE: Thomson Reuters Essential Science Indicators, January 1999–December 2009

The data above were extracted from the Essential Science Indicators database of Thomson Reuters. The database, currently covering the period January 1999 through December 2009, surveys only journal articles (original research reports and review articles) indexed by Thomson Reuters. Articles are assigned to a category based on the journals in which they were published and the journal-to-category field definition scheme used by Thomson Reuters. Both articles tabulated and citation counts to those articles are for the period indicated.

England ranks 4^th in output, 2^nd in citations received, and 6^th in citations per paper (among nations publishing 50,000 or more papers during the period) across the science and social science fields surveyed in Essential Science Indicators. The table above ranks fields for England by relative citation impact, that is, citations per paper for England in a field compared with the world’s citations per paper score in the same field. England’s percentage above or below the world average is presented in the column at far right. For more information on the Thomson Reuters Essential Science Indicators database, see: http://scientific.thomsonreuters.com/products/esi