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Median Impact Factor : (from JCR Science Edition : Year 2007)

No. Subject Category Total Cites Median IF Aggregate IF # Journals Articles 1 Acoustics 71595 0.738 1.249 28 3691 2 Agricultural Economics & Policy 5653 0.635 0.763 9 424 3 Agricultural Engineering 22080 1.199 1.619 9 1351 4 Agriculture, Dairy & Animal Science 93181 0.696 1.144 47 5646 5 Agriculture, Multidisciplinary 80383 0.425 1.439 35 4193 6 Agronomy 106963 1.000 1.251 49 5340 7 Allergy 63624 2.160 3.385 17 2050 8 Anatomy & Morphology 36463 1.423 1.792 17 1486 9 Andrology 6961 1.609 1.891 5 375 10 Anesthesiology 96556 1.485 2.259 22 3332 11 Astronomy & Astrophysics 539716 1.441 4.021 48 13810 12 Automation & Control Systems 73591 0.832 1.126 52 4611 13 Behavioral Sciences 165109 2.355 2.710 45 4500 14 Biochemical Research Methods 339628 2.135 3.270 60 12571 15 Biochemistry & Molecular Biology 2383087 2.550 4.225 263 48051 16 Biodiversity Conservation 60510 1.295 2.081 27 2409 17 Biology 217563 1.292 2.687 70 6608 18 Biophysics 394739 2.371 2.996 69 11795 19 Biotechnology & Applied Microbiology 491863 1.937 2.934 138 19568 20 Cardiac & Cardiovascular Systems 493427 1.828 3.757 74 13000 21 Cell Biology 1199167 2.984 5.603 156 21226 22 Chemistry, Analytical 435144 1.601 2.555 70 17428 23 Chemistry, Applied 189615 0.862 1.768 62 10635 24 Chemistry, Inorganic & Nuclear 286910 1.260 2.192 43 11616 25 Chemistry, Medicinal 187782 1.817 2.516 41 8860 26 Chemistry, Multidisciplinary 973867 1.032 3.463 127 29835 27 Chemistry, Organic 489970 1.808 2.666 56 19182 28 Chemistry, Physical 839377 1.739 2.676 110 32287 29 Clinical Neurology 578829 1.946 2.746 146 18450 30 Computer Science, Artificial Intelligence 129000 1.027 1.442 93 6227 31 Computer Science, Cybernetics 14373 0.864 0.833 17 1070 32 Computer Science, Hardware & Architecture 59035 0.776 0.989 45 3361 33 Computer Science, Information Systems 90998 0.802 1.156 92 6630 34 Computer Science, Interdisciplinary Applications 138744 0.863 1.587 92 8710 35 Computer Science, Software, Engineering 73379 0.801 0.913 84 5263 36 Computer Science, Theory & Methods 85974 0.799 0.988 79 4743 37 Construction & Building Technology 27341 0.515 0.680 34 2866 38 Critical Care Medicine 121257 1.837 3.599 19 3311 39 Crystallography 123384 1.153 1.131 25 11254 40 Dentistry, Oral Surgery & Medicine 146199 1.592 1.699 51 6089 41 Dermatology 120579 1.402 1.956 41 4750 42 Developmental Biology 213018 2.805 4.819 37 4152 43 Ecology 451081 1.532 2.502 116 12742 44 Education, Scientific Disciplines 26299 0.663 1.026 23 2061 45 Electrochemistry 161520 1.936 2.600 23 7676 46 Emergency Medicine 28853 1.046 1.423 12 1767 47 Endocrinology & Metabolism 519082 2.566 3.878 92 12886 48 Energy & Fuels 114275 0.829 1.471 64 9676 49 Engineering, Aerospace 24718 0.420 0.591 24 2175 50 Engineering, Biomedical 131823 1.540 2.481 44 6097 51 Engineering, Chemical 277418 0.791 1.390 114 17781 52 Engineering, Civil 77784 0.530 0.884 88 7574 53 Engineering, Electrical & Electronic 482799 0.776 1.216 227 33510 54 Engineering, Environmental 138163 1.086 2.280 37 6916 55 Engineering, Geological 19571 0.653 0.775 26 1448 56 Engineering, Industrial 42498 0.560 0.752 33 3358 57 Engineering, Manufacturing 40029 0.603 0.703 38 4175 58 Engineering, Marine 934 0.410 0.110 6 518 59 Engineering, Mechanical 130454 0.553 0.846 107 10985 60 Engineering, Multidisciplinary 75430 0.525 1.233 67 6289 61 Engineering, Ocean 9872 0.310 0.698 15 908 62 Engineering, Petroleum 11556 0.343 0.337 23 1860 63 Entomology 90575 0.739 1.131 73 5064 64 Environmental Sciences 494853 1.280 2.028 160 23123 65 Evolutionary Biology 182850 2.524 3.631 35 4178 66 Fisheries 94436 1.152 1.341 40 3976 67 Food Science & Technology 257166 0.911 1.583 103 14306 68 Forestry 60452 0.759 1.211 39 2894 69 Gastroenterology & Hepatology 301398 2.187 3.753 50 8813 70 Genetics & Heredity 675463 2.595 4.406 132 16059 71 Geochemistry & Geophysics 218511 1.179 1.929 63 6462 72 Geography, Physical 71137 1.633 1.863 31 2832 73 Geology 57700 0.793 1.582 40 2030 74 Geosciences, Multidisciplinary 403346 1.091 1.769 137 15150 75 Geriatrics & Gerontology 69577 2.140 2.734 31 2503 76 Health Care Sciences & Services 80839 1.436 1.809 57 4370 77 Hematology 503719 2.180 5.245 63 10203 78 History & Philosophy of Science 10638 0.378 0.590 37 1007 79 Horticulture 48724 0.699 1.233 22 2123 80 Imaging Science & Photographic Technology 30746 0.889 1.587 11 1157 81 Immunology 761918 2.599 4.231 119 18269 82 Infectious Diseases 265319 2.369 3.546 50 8447 83 Instruments & Instrumentation 133314 0.832 1.279 55 11076 84 Integrative & Complementary Medicine 14570 1.236 1.669 12 1018 85 Limnology 54646 1.118 1.760 19 1643 86 Marine & Freshwater Biology 234921 1.155 1.646 86 8724 87 Materials Science, Biomaterials 57730 1.889 3.489 16 2665 88 Materials Science, Ceramics 67661 0.429 1.045 25 4264 89 Materials Science, Characterization & Testing 11585 0.444 0.599 29 1591 90 Materials Science, Coatings & Films 111562 0.603 1.649 18 5527 91 Materials Science, Composites 24250 0.600 1.101 21 2045 92 Materials Science, Multidisciplinary 657433 0.985 1.998 189 40905 93 Materials Science, Paper & Wood 13819 0.556 0.450 18 1201 94 Materials Science, Textiles 9921 0.506 0.785 15 1221 95 Mathematical & Computetional Biology 96581 1.490 2.883 26 3651 96 Mathematics 212467 0.525 0.600 207 16141 97 Mathematics, Applied 197166 0.689 0.856 165 15477 98 Mathematics, Interdisciplinary Applications 106001 0.778 1.324 74 5557 99 Mechanics 211709 0.823 1.206 112 11759 100 Medical Ethics 5067 1.152 1.289 7 416 101 Medical Informatics 27873 1.444 1.414 20 1717 102 Medical Laboratory Technology 67198 1.619 2.080 26 2559 103 Medicine, General & Internal 770230 1.331 4.705 100 13352 104 Medicine, Legal 14867 1.042 1.508 9 999 105 Medicine, Research & Experimental 404101 1.806 3.459 81 10998 106 Metallurgy & Metallurgical Engineering 126927 0.437 0.961 66 11269 107 Meteorology & Atmospheric Sciences 181617 1.562 2.021 51 6610 108 Microbiology 517304 2.292 3.319 94 15398 109 Microscopy 19706 1.644 1.703 9 818 110 Mineralogy 52715 1.081 1.522 25 1751 111 Mining & Mineral Processing 21020 0.538 0.935 16 1715 112 Multidisciplinary Sciences 1288998 0.589 8.134 50 10657 113 Mycology 27080 1.327 1.768 19 1349 114 Nanoscience and Nanotechnology 133788 1.438 2.542 46 10000 115 Neuroimaging 56930 1.625 3.504 13 1713 116 Neurosciences 1246683 2.402 3.734 211 28434 117 Nuclear Science & Technology 88093 0.534 0.898 31 8608 118 Nursing 37467 0.925 1.031 46 2675 119 Nutrition & Dietetics 197542 1.826 2.655 56 7026 120 Obstetrics & Gynecology 189509 1.429 2.110 60 8164 121 Oceanography 131675 1.236 1.723 50 4452 122 Oncology 881363 2.564 4.551 132 23183 123 Operations Research & Management Science 88398 0.700 0.906 60 5084 124 Ophthalmology 179507 1.443 2.197 45 7073 125 Optics 289328 0.836 1.912 64 18164 126 Ornithology 23864 0.745 1.104 19 1135 127 Orthopedics 176466 1.294 1.666 48 7204 128 Otorhinolaryngology 70820 0.983 1.159 29 4025 129 Paleontology 47003 0.827 1.280 40 2010 130 Parasitology 60185 1.597 2.114 23 3111 131 Pathology 191773 1.783 2.539 66 6180 132 Pediatrics 236924 1.258 1.811 78 10753 133 Peripheral Vascular Disease 420928 2.183 4.626 54 8306 134 Pharmacology & Pharmacy 753586 2.066 2.788 205 27748 135 Physics, Applied 626095 1.284 2.021 94 37728 136 Physics, Atomic, Molecular & Chemical 435265 1.538 2.330 32 14231 137 Physics, Condensed Matter 533911 1.259 1.993 61 24302 138 Physics, Fluids & Plasmas 149870 1.186 2.040 25 6159 139 Physics, Mathematical 176749 1.339 1.854 43 9152 140 Physics, Multidisciplinary 594891 0.951 2.669 69 20197 141 Physics, Nuclear 106622 1.455 1.807 21 6361 142 Physics, Particles & Fields 231639 1.894 3.034 24 9720 143 Physiology 396863 2.034 3.187 78 10915 144 Plant Sciences 487368 1.081 2.286 152 14684 145 Polymer Science 319421 1.040 2.089 74 13234 146 Psychiatry 406427 2.157 3.409 94 10258 147 Psychology 184906 1.992 2.386 61 3984 148 Public, Environmental & Occupational Health 309667 1.597 2.236 100 11171 149 Radiology, Nuclear Medicine & Medical Imaging 363419 1.625 2.505 87 13002 150 Rehabilitation 42080 1.414 1.509 27 2162 151 Remote Sensing 35937 1.110 1.594 14 1621 152 Reproductive Biology 112879 2.370 2.696 25 3685 153 Respiratory System 220320 2.210 3.137 34 6418 154 Rheumatology 110721 2.248 3.827 21 3712 155 Robotics 11762 0.633 0.710 13 777 156 Soil Science 90514 1.099 1.418 30 3343 157 Spectroscopy 128331 1.433 1.728 39 7617 158 Sport Sciences 149107 1.157 1.696 72 5961 159 Statistics & Probability 178807 0.787 1.465 91 6512 160 Substance Abuse 41129 2.117 2.596 10 1470 161 Surgery 599553 1.225 1.912 139 24637 162 Telecommunications 73345 0.509 0.882 66 7656 163 Thermodynamics 71850 0.879 1.132 43 5109 164 Toxicology 193395 1.942 2.356 73 7874 165 Transplantation 97885 2.300 2.616 21 4428 166 Transportation Science & Technology 12612 0.538 0.779 22 1321 167 Tropical Medicine 36083 1.279 1.633 14 1836 168 Urology & Nephrology 239054 1.926 2.839 55 9345 169 Veterinary Sciences 182009 0.646 1.124 133 12674 170 Virology 195028 2.810 3.732 25 5375 171 Water Resources 141441 1.021 1.360 59 7399 172 Zoology 221537 0.940 1.459 124 9043 The aggregate impact factor for a subject category is calculated the same way as the impact factor for a journal, but it takes into account the number of citations to all journals in the category and the number of articles from all journals in the category. An aggregate impact factor of 1.0 means that that, on average, the articles in the subject category published one or two years ago have been cited one time. The median impact factor is the median value of all journal impact factors in the subject category.

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