The Cochrane Library Impact Factor Data Pack When considering the data presented below, please be aware of the following: The dataset we have used to generate impact factors for individual review groups (ISI Web of Science) is slightly different to the dataset that ISI use to calculate the impact factors of journals (the Journal Citation Report). Individual Cochrane Review Group (CRG) impact factor data, therefore, should not be quoted as official impact factors, but can be used within the Collaboration. Both ISI databases (Web of Science and Journal Citation Report) report upon the number of articles published in a year. For The Cochrane Database of Systematic Reviews (CDSR) this means all new reviews plus all updated Reviews that have a new citation record. Each individual review group faces a variety of challenges in the publication of Cochrane Reviews, and some of these may impact upon the data presented below. For example, if a CRG publishes a large number of updated Reviews with new citation records these may increase the ratio of publications to citations, thereby lowering the impact factor. The 2010 impact factor is based upon articles published during 2008 and 2009; therefore, CRGs that did not publish a review in 2008 or 2009 are not included in the impact factor calculation. The Public Health Group did not publish a Review in 2008 or 2009 (See CRG s taken from TCL website spreadsheet ), therefore are not represented in Figures 2, 3 and 4. All fifty-three CRGs are represented in Figures 5, 6 and 7. 1. How contributes to Cochrane Database of Systematic Reviews (CDSR): a) Each year in June Thompson Reuters publish the impact factors of all journals indexed in the ISI Journal Citation Report. b) The 2010 impact factor for CDSR is 6.186, which describes the ratio of the number of reviews published during 2008 and 2009 (1128) to the number of citations these reviews received in 2010 (6978). The 2010 CRG impact factor for is 6.000 (13 publications cited 78 times). A review published by the in 2008 or 2009 was cited, on average, 6.000 times in 2010. 1
c) The top ten most cited reviews from the contributing to the 2010 impact factor are: CD Number Review Title Times cited in 2010 CD000396 Non-steroidal anti-inflammatory drugs for low back pain 13 CD004057 Individual patient education for low back pain 11 CD003008 Transcutaneous electrical nerve stimulation (TENS) versus placebo for chronic low-back pain 9 CD001703 Antidepressants for non-specific low back pain 7 CD004251 Electrotherapy for neck pain 7 CD006408 Mechanical traction for neck pain with or without radiculopathy 7 CD001823 Lumbar supports for prevention and treatment of low back pain 6 CD001929 Massage for low-back pain 6 CD001824 Injection therapy for subacute and chronic low-back pain 5 CD005106 Patient education for neck pain with or without radiculopathy 3 The full list of Reviews contributing to the 2010 impact factor for the is provided in the accompanying Excel file. 2
d) The top ten most cited reviews (2010) published in the CDSR (all CRGs) contributing to the 2010 impact factor are: Review Title Interventions for preventing falls in older people living in the community CRG Bone, Joint and Muscle Trauma Group Times Cited in 2010 89 Interventions for enhancing medication adherence Consumers and Communication Group 85 Nicotine replacement therapy for smoking cessation Tobacco Addiction Group 78 Interventions for treating obesity in children Heart Group 50 Publication bias in clinical trials due to statistical significance or direction of trial results Methodology Review Group 45 Physical activity and enhanced fitness to improve cognitive function in older people without known cognitive impairment Dementia and Cognitive Impairment Group 45 Antioxidant supplements for prevention of mortality in healthy participants and patients with various diseases Hepato-Biliary Group 37 Vaccines for preventing pneumococcal infection in adults Acute Respiratory Infections Group 36 Exercise for the management of cancer-related fatigue in adults Pain, Palliative and Supportive Care Group 35 Physician advice for smoking cessation Tobacco Addiction Group 34 Decision aids for people facing health treatment or screening decisions Bone, Joint and Muscle Trauma Group 34 2. How the impact factor compares to that of other Cochrane Review Groups (CRGs): a) Figure 1, details the number of publications and citations contributing to the 2010 impact factor for each CRG as a percentage of the CDSR. Figure 2 shows the 2010 CRG impact factor for each CRG. Figure 3 represents a comparison between the 2010 CRG impact factor and the 2009 CRG impact factor for each CRG. It is important to remember that these figures have been calculated using datasets from ISI Web of Science and are not official impact factors. 3
Pregnancy and Childbirth Group Pain, Palliative and Supportive Care Group Menstrual Disorders and Subfertility Group Airways Group Neonatal Group Stroke Group Acute Respiratory Infections Group Hepato-Biliary Group Cystic Fibrosis and Genetic Disorders Group Neuromuscular Disease Group Oral Health Group Musculoskeletal Group Developmental, Psychosocial and Learning Eyes and Vision Group Renal Group Anaesthesia Group Schizophrenia Group Depression, Anxiety and Neurosis Group Effective Practice and Organisation of Care Group Injuries Group Peripheral Vascular Diseases Group Dementia and Cognitive Improvement Group Colorectal Cancer Care Group Metabolic and Endocrine Disorders Group Inflammatory Bowel Disease and Functional Wounds Group Gynaecological Cancer Group Drugs and Alcohol Group Infectious Diseases Group Bone, Joint and Muscle Trauma Group HIV/AIDS Group Fertility Regulation Group Epilepsy Group Hypertension Group Tobacco Addiction Group Skin Group Heart Group Ear, Nose and Throat Disorders Group Incontinence Group Breast Cancer Group Haematological Malignancies Group Consumers and Communication Group Movement Disorders Group Upper Gastrointestinal and Pancreatic Diseases Multiple Sclerosis Group Methodology Review Group Prostatic Diseases and Urologic Cancers Group Lung Cancer Group Childhood Cancer Group Sexually Transmitted Diseases Group Occupational Safety and Health Group Figure 1: % Publications (Dark blue) and % Citations (Light blue) of CDSR for each CRG 7% 6% 5% % Publications % Citations 4% 3% 2% 1% 0% 4
Methodology Review Group Tobacco Addiction Group Consumers and Communication Group Dementia and Cognitive Improvement Group Bone, Joint and Muscle Trauma Group Heart Group Colorectal Cancer Care Group Drugs and Alcohol Group Incontinence Group Musculoskeletal Group Metabolic and Endocrine Disorders Group Depression, Anxiety and Neurosis Group Breast Cancer Group Effective Practice and Organisation of Care Group Wounds Group Movement Disorders Group Pain, Palliative and Supportive Care Group Prostatic Diseases and Urologic Cancers Group Inflammatory Bowel Disease and Functional Bowel Neonatal Group Skin Group Acute Respiratory Infections Group Infectious Diseases Group Neuromuscular Disease Group Stroke Group Renal Group Airways Group Pregnancy and Childbirth Group HIV/AIDS Group Hypertension Group Anaesthesia Group Multiple Sclerosis Group Menstrual Disorders and Subfertility Group Injuries Group Lung Cancer Group Peripheral Vascular Diseases Group Fertility Regulation Group Hepato-Biliary Group Haematological Malignancies Group Gynaecological Cancer Group Childhood Cancer Group Oral Health Group Epilepsy Group Developmental, Psychosocial and Learning Problems Schizophrenia Group Ear, Nose and Throat Disorders Group Upper Gastrointestinal and Pancreatic Diseases Group Sexually Transmitted Diseases Group Cystic Fibrosis and Genetic Disorders Group Eyes and Vision Group Occupational Safety and Health Group Figure 2: CRG impact factor for each CRG (i.e. number of cites in 2010 to reviews published by in 2008 2009, divided by the number of reviews published in 2008 2009) 18 16 14 12 10 8 CDSR Impact Factor 2010 = 6.186 Mean = 5.915 6 4 2 0 5
Consumers and Communication Group Methodology Review Group Bone, Joint and Muscle Trauma Group Dementia and Cognitive Improvement Group Heart Group Breast Cancer Group Wounds Group Incontinence Group Lung Cancer Group Movement Disorders Group Infectious Diseases Group Colorectal Cancer Group Developmental, Psychosocial and Learning Problems Group Oral Health Group Epilepsy Group Skin Group HIV/AIDS Group Neonatal Group Renal Group Metabolic and Endocrine Disorders Group Musculoskeletal Group Fertility Regulation Group Haematological Malignancies Group Prostatic Diseases and Urologic Cancers Group Hepato-Biliary Group Pregnancy and Childbirth Group Schizophrenia Group Depression, Anxiety and Neurosis Group Upper Gastrointestinal and Pancreatic Diseases Group Airways Group Anaesthesia Group Acute Respiratory Infections Group Neuromuscular Disease Group Menstrual Disorders and Subfertility Group Cystic Fibrosis and Genetic Disorders Group Effective Practice and Organisation of Care Group Peripheral Vascular Diseases Group Drugs and Alcohol Group Tobacco Addiction Group Pain, Palliative and Supportive Care Group Stroke Group Gynaecological Cancer Group Sexually Transmitted Diseases Group Multiple Sclerosis Group Injuries Group Inflammatory Bowel Disease and Functional Bowel Disorders Group Hypertension Group Eyes and Vision Group Ear, Nose and Throat Disorders Group Figure 3: % CRG impact factor difference 2009-2010 for each CRG 12% 10% 8% 6% 4% 2% 0% -2% -4% 6
3. How the impact factor compares with that of journals publishing in the same subject: We have compared the CRG data with journals in the relevant subject categories. Sometimes the journal with the top impact factor is not directly comparable either because of the scope of the journal, or the number of reviews published in which case we have identified a journal as a possible match to the review group subject area. CRG Category (median IF) Top Journal by IF Possible match from subject Clinical Neurology / Orthopaedics Lancet Neurology / Osteoarthritis and Cartilage Pain / Spine 6.000 1.994 / 1.164 21.659 / 3.953 5.355 / 2.510 Please contact Gavin Stewart (gstewart@wiley.com) if you would like to see comparisons to other journals. 4. How the citation data compare to Wiley Online Library usage data: a) Each Review in CDSR, regardless of publication date, was accessed in full-text format on average 589.96 times during 2010 (4615 articles accessed 2,722,663 times). This is an increase of 6.4% on the 2009 figure of 554.60 (4524 articles accessed 2,508,999 times). Reviews published by the were accessed in full-text format on average 1107.89 times during 2010 (54 articles accessed 59,826 times). This is an increase of 6% on the 2009 figure of 1038.31 (54 articles accessed 56,069 times). 7
b) The top ten most accessed reviews from the are: CD Number Review Title Full Text Accesses CD000335 Exercise therapy for treatment of non-specific low back pain 3700 CD004249 Manipulation or Mobilisation for Neck Pain 3605 CD007431 Physical examination for lumbar radiculopathy due to disc herniation in patients with low-back pain 3028 CD001929 Massage for low-back pain 2842 CD001351 Acupuncture and dry-needling for low back pain 2704 CD004250 Exercises for mechanical neck disorders 2088 CD002014 Behavioural treatment for chronic low-back pain 2010 CD006555 Exercises for prevention of recurrences of low-back pain 1777 CD005427 Combined chiropractic interventions for low-back pain 1665 CD001822 Physical conditioning programs for improving work outcomes in workers with back pain 1648 The access data for all Reviews during 2010 is provided in the accompanying Excel file. 5. How the usage of reviews compares to usage of reviews published by other Cochrane Review Groups: a) Figure 4, details the number of publications and full text accesses contributing to the usage figure of 589.96 for each CRG as a percentage of the CDSR. Figure 5 shows the average usage per review as accessed via Wiley Online Library during 2010 (regardless of publication date). Figure 6 shows a comparison between the 2010 usage figure and the 2009 usage figure for each CRG. 8
Pregnancy and Childbirth Group Neonatal Group Airways Group Menstrual Disorders and Subfertility Group Schizophrenia Group Pain, Palliative and Supportive Care Group Musculoskeletal Group Stroke Group Hepato-Biliary Group Acute Respiratory Infections Group Depression, Anxiety and Neurosis Group Oral Health Group Injuries Group Infectious Diseases Group Cystic Fibrosis and Genetic Disorders Group Gynaecological Cancer Group Bone, Joint and Muscle Trauma Group Dementia and Cognitive Improvement Group Renal Group Neuromuscular Disease Group Heart Group Eyes and Vision Group Developmental, Psychosocial and Learning Problems Group Peripheral Vascular Diseases Group Colorectal Cancer Group Metabolic and Endocrine Disorders Group Ear, Nose and Throat Disorders Group Anaesthesia Group HIV/AIDS Group Effective Practice and Organisation of Care Group Wounds Group Incontinence Group Fertility Regulation Group Inflammatory Bowel Disease and Functional Bowel Disorders Group Epilepsy Group Drugs and Alcohol Group Tobacco Addiction Group Movement Disorders Group Upper Gastrointestinal and Pancreatic Diseases Group Skin Group Breast Cancer Group Hypertension Group Prostatic Diseases and Urologic Cancers Group Consumers and Communication Group Multiple Sclerosis Group Lung Cancer Group Haematological Malignancies Group Methodology Review Group Childhood Cancer Group Sexually Transmitted Diseases Group Occupational Safety and Health Group Public Health Group Figure 4: % Publications (dark blue) and % Full Text Accesses (light blue) of CDSR for each CRG (in order of percentage of publications) 12% 10% 8% % Publications % Full Text Accesses 6% 4% 2% 0% 9
Public Health Group Effective Practice and Organisation of Care Group Wounds Group Metabolic and Endocrine Disorders Group Consumers and Communication Group Bone, Joint and Muscle Trauma Group Heart Group Tobacco Addiction Group Depression, Anxiety and Neurosis Group Hypertension Group Musculoskeletal Group Breast Cancer Group Acute Respiratory Infections Group Pain, Palliative and Supportive Care Group Anaesthesia Group Stroke Group Oral Health Group Developmental, Psychosocial and Learning Problems Group Upper Gastrointestinal and Pancreatic Diseases Group Pregnancy and Childbirth Group Dementia and Cognitive Improvement Group Incontinence Group Drugs and Alcohol Group Colorectal Cancer Group Skin Group Multiple Sclerosis Group Renal Group Methodology Review Group Peripheral Vascular Diseases Group Sexually Transmitted Diseases Group Injuries Group Neuromuscular Disease Group Inflammatory Bowel Disease and Functional Bowel Disorders Group Schizophrenia Group HIV/AIDS Group Ear, Nose and Throat Disorders Group Fertility Regulation Group Airways Group Prostatic Diseases and Urologic Cancers Group Movement Disorders Group Lung Cancer Group Menstrual Disorders and Subfertility Group Haematological Malignancies Group Gynaecological Cancer Group Neonatal Group Cystic Fibrosis and Genetic Disorders Group Infectious Diseases Group Childhood Cancer Group Epilepsy Group Hepato-Biliary Group Eyes and Vision Group Occupational Safety and Health Group Figure 5: Average number of full-text accesses during 2010 by Cochrane Review Group 2500 2000 1500 1000 Average number of accesses for a Review in CDSR during 2010 = 589.96 500 0 10
Public Health Group Upper Gastrointestinal and Pancreatic Diseases Group Childhood Cancer Group Effective Practice and Organisation of Care Group Consumers and Communication Group Anaesthesia Group Fertility Regulation Group Oral Health Group Cystic Fibrosis and Genetic Disorders Group Sexually Transmitted Diseases Group Movement Disorders Group Heart Group Pain, Palliative and Supportive Care Group Ear, Nose and Throat Disorders Group Hypertension Group Wounds Group Gynaecological Cancer Group Developmental, Psychosocial and Learning Problems Group Schizophrenia Group Skin Group Methodology Review Group Musculoskeletal Group Lung Cancer Group Peripheral Vascular Diseases Group Bone, Joint and Muscle Trauma Group Stroke Group Eyes and Vision Group Haematological Malignancies Group Pregnancy and Childbirth Group Depression, Anxiety and Neurosis Group Drugs and Alcohol Group Acute Respiratory Infections Group Menstrual Disorders and Subfertility Group Incontinence Group Breast Cancer Group Airways Group Infectious Diseases Group Renal Group Injuries Group Neuromuscular Disease Group Colorectal Cancer Group Dementia and Cognitive Improvement Group Tobacco Addiction Group Prostatic Diseases and Urologic Cancers Group Metabolic and Endocrine Disorders Group Neonatal Group Hepato-Biliary Group Multiple Sclerosis Group HIV/AIDS Group Epilepsy Group Inflammatory Bowel Disease and Functional Bowel Occupational Safety and Health Group Figure 6: % average full text access difference 2009-2010 for each CRG 100% 80% 60% 40% 20% 0% -20% 11
Additional resources: A Frequently Asked Questions (FAQ) document is available from The Cochrane Library homepage, which describes the CDSR impact factor and contains additional information about the citation index. You can access this document here. If you have any further queries regarding the data presented in this report, please contact Gavin Stewart (gstewart@wiley.com). 12