About the Data Collection The publication years of 2006 and 2009 were selected to study the impact of the NIH PAP. *Selecting the Journals* A set of journal titles was identified from which to provide a collection of articles to examine. Using a collection of articles from a specified set of journals allows for uniformity between the articles compared in 2006 and 2009; articles published within any given journal should continue to have a similar scope and a relatively similar impact factor across the timespan studied. A list of journals was developed from two sources: 1) the top 200 ranked journals based on impact factor in Journal Citation Reports (JCR) from the categories Behavioral Sciences, General and Internal Medicine, Research and Experimental Medicine, Nursing, and Obstetrics & Gynecology and 2) journals on the AIM (Abridged Index Medicus) list. AIM is a list of approximately 120 core clinical English language journals developed and maintained by the National Library of Medicine [18]. Journals were excluded from the list if: 1) They were not indexed in Scopus. Scopus was the database selected to provide the number of cited references for each article included in the study. Scopus has been reported to be the most comprehensive article-level index of scholarly articles [19]. 2) They were an open access journal or became freely accessible after an embargo period (e.g. freemedicaljournals.com). 3) None of the 2009 articles in a journal were archived in PubMedCentral. The inclusion requirement for a journal to have at least one article archived in PMC in 2009 ensured there were articles for comparison to other non-PMC archived articles in the journal. 4) Less than 2% of the articles in a journal were funded by the NIH. Requiring a certain percent of articles to be funded by the NIH ensured there were at least some articles in the NIH funded group for each journal included in the study. *Obtaining the Citation Information - list of study articles and citation counts* The citation information and cited reference counts of all the articles published in 2006 and 2009 for the journals included in the study were obtained from Scopus. Scopus sSearches were limited to article or review articles to eliminate journal articlesitems such as letters and editorials. Further searches were performed in PubMed Further searches were done using “publication type” information from PubMed to remove non-research items journal articles such as editorials, letters, bibliographies, and retraction notices. This provided additionaly limits beyond what was , not already filtered through Scopus. *Determining NIH Status and PMC Status* To determine which of these articles were funded by NIH or included full-text in PMC, searches for each of the journals were performed in PubMed. The “free full-text” filter was used to indicate articles available in PMC. Each 2009 article archived in PMC was examined in PMC to determine the number of months after the official date of publication the article became available in PMC. 2009 articles not available in PMC by January 2013 were treated as non-PMC articles as it is unlikely these articles would be cited in another 2013 publication. The “Research Support, N.I.H. Extramural” and “Research Support, N.I.H. Intramural” filters were used to identify articles funded by the NIH. Some articles were noted to be available full-text in PMC but not appear with NIH funding when the filters were used. In these cases, the abstract view was selected to view the "Grant Support" provided for the article. Articles with NIH funding listed in the grant support field were also noted to have NIH funding. Articles in PMC that had no indication of NIH funding in the PubMed were dropped from the study as they were likely funded by a non-US source also requiring deposit in PMC (PMC Canada, PMC Europe). Since individual articles could only be archived in PMC if they were the result of NIH funding, articles found in PMC were assumed to be NIH funded, even if the filters did not indicate this. *Date range for Data Collection from each set* In order to ensure that an equal number of years of citing data were examined for 2006 and for 2009, equivalent date limitations were imposed. Citing data was captured for a five-year period for both the pre- and post- NIH PAP articles. For the set of articles published in 2006, citing data from 2006-2010 was recorded. For the set of articles published in 2009, citing data from 2009-2013 was recorded. For the 2006 data, the number of citing references from articles published in 2006 to 2010 was recorded, and for the 2009 data, the number of citing references from articles published in 2009 to 2013 was recorded. The citations were then categorized articles into independent groups of journal articles based on year published, NIH funding, and PMC availability. **CODING** *Headings in Spreadsheet* Year = year article was published Document title - Title of article Authors - authors of article ISSN - ISSN of journal article was published in Journal Title - Journal article was published in Volume - Volume of Journal article published in Issue - Issue of journal article published in Y6 - times the article was cited after the 5 years studied in this particular study Y1A - Y5A - accumulated data for each year (see under coding) NIH - funded by NIH PMC - found in PMC JCR - journal was found in JCR AIM - journal was found on Abrided Index Medicus list code - code based on NIH, PMC status (see below for specifics) NIH Code - done for between year comparison (see below for specifics) Months - how many months after article was officially published by journal did it appeared in PMC Number of Commas = how many commas separated author names - which would be equal to the number of authors minus 1 Number of authors = number of authors on the article (# of commas plus 1) Code - & NIH Code code Code NIH Code 0= No NIH, No PMC 0 0 1 = NIH funded 2006 1 1 3 = NIH funded and in PMC 2006 3 3 4 = NIH funded 2009 4 4 6 = NIH funded and in PMC 2009 6 1 Year 2006=articles published in 2006 2009=articles published in 2009 ISSN=ISSN of journal - see tab Journals in study for Journal associated with ISSN Y=Year (Y1, Y2, Y3, Y4, Y5) = Number of times journal article cited that year YA=accumulated data from previous years and current year year 2006 2009 times cited times cited accumulative 2006 2009 Y1 Y1A = Y1 2007 2010 Y2 Y2A = Y1 + Y2 2008 2011 Y3 Y3A = Y1 + Y2 + Y3 2009 2012 Y4 Y3A = Y1 + Y2 + Y3 + Y4 2010 2013 Y5 Y5A = Y1 + Y2 + Y3 + Y4 + Y5 JCR=source of titles inclusion in study was one of top JCR impact journals in catagories selected for study (journal citation reports) 1=JCR 0=no AIM= abridged indexed medicus title list 1=AIM 0=no ISSN** Journal Name ** - some ISSNs were altered to fit in SPSS - ISSN listed below may not be direct match to true ISSN 28703 American Heart Journal 29149 American Journal of Cardiology 29343 American Journal of Medicine 29378 American Journal of Obstetrics and Gynecology 29394 American Journal of Ophthalmology 7351631 American Journal of Perinatology 8949115 American Journal of Physical Medicine and Rehabilitation 7493797 American Journal of Preventive Medicine 29610 American Journal of Surgery 14359448 Animal Cognition 1960644 Annals of Emergency Medicine 34819 Annals of Internal Medicine 7853890 Annals of Medicine 34894 Annals of Otology, Rhinology and Laryngology 664219 Annual Review of Medicine 1956663 Appetite 8971897 Applied Nursing Research 39926 Archives of Internal Medicine 18244 Behavior Genetics 7357044 Behavioral Neuroscience 1664328 Behavioural Brain Research 9558810 Behavioural Pharmacology 3766357 Behavioural Processes 3010511 Biological Psychology 10998004 Biological Research for Nursing 10751229 Breast journal 10849785 Cancer Biotherapy and Radiopharmaceuticals 16222099 Cancer Nursing 99201 Clinical Obstetrics and Gynecology 99236 Clinical Pharmacology and Therapeutics 955108 Clinics in Perinatology 15433633 Cognitive and Behavioral Neurology 15517144 Contemporary Clinical Trials 107824 Contraception 109452 Cortex 903493 Critical Care Medicine 14648431 Current Opinion in Molecular Therapeutics 10408729 Current Opinion in Obstetrics and Gynecology 14653249 Cytotherapy 1632116 Digestive Diseases and Sciences 3783782 Early Human Development 15255050 Epilepsy and Behavior 3012115 European Journal of Obstetrics Gynecology and Reproductive Biology 30147299 Experimental Hematology 14712598 Expert Opinion on Biological Therapy 150282 Fertility and Sterility 165085 Gastroenterology 15508579 Gender Medicine 908258 Gynecologic Oncology 1850699 Hormones and Behavior 10430342 Human Gene Therapy 10641955 Hypertension in Pregnancy 10488919 International Journal of Gynecological Cancer 207292 International Journal of Gynecology and Obstetrics 207489 International Journal of Nursing Studies 3092402 Journal of Advanced Nursing 916749 Journal of allergy and clinical immunology 8894655 Journal of Cardiovascular Nursing 15821838 Journal of Cellular and Molecular Medicine 7357036 Journal of Comparative Psychology 19620699 Journal of Developmental and Behavioral Pediatrics 10950680 Journal of ECT 977403 Journal of Experimental Psychology: Animal Behavior Processes 943509 Journal of family practice 10994989 journal of gene medicine 15249557 Journal of Immunotherapy 10815589 Journal of Investigative Medicine 14767058 Journal of Maternal-Fetal and Neonatal Medicine 9462716 Journal of Molecular Medicine 223018 Journal of nervous and mental disease 223085 Journal of Neurosurgery 20443 Journal of Nursing Administration 15276546 Journal of Nursing Scholarship 8853924 Journal of Pain and Symptom Management 10833188 Journal of Pediatric and Adolescent Gynecology 223476 Journal of Pediatrics 3005577 Journal of Perinatal Medicine 10727515 Journal of the American College of Surgeons 225347 Journal of urology 15409996 Journal of Women's Health 1406736 Lancet 2385299 Laryngoscope 243205 Life Sciences 3785122 Maturitas 9608931 Melanoma Research 10723714 Menopause 982997 Molecular Aspects of Medicine 10967192 Molecular Genetics and Metabolism 272507 Mount Sinai Journal of Medicine 10788956 Nature Medicine 10747427 Neurobiology of Learning and Memory 283878 Neurology 283932 Neuropsychologia 1497634 Neuroscience and Biobehavioral Reviews 296465 Nursing Clinics of North America 296554 Nursing Outlook 296562 Nursing Research 8898545 Obstetrics and Gynecology Clinics of North America 19053599 Oncology Nursing Forum 2695022 Paediatric and Perinatal Epidemiology 15262375 Pain Medicine 2692163 Palliative Medicine 313955 Pediatric clinics of North America 315982 Perspectives in Biology and Medicine 913057 Pharmacology Biochemistry and Behavior 319384 Physiology and Behavior 1434004 Placenta 321052 Plastic and Reconstructive Surgery 917435 Preventive Medicine 330620 Progress in Cardiovascular Diseases 1606891 Research in Nursing and Health 1460005 Seminars in Perinatology 15268004 Seminars in Reproductive Medicine 2776715 Statistics in Medicine 15473287 Stem Cells and Development 396060 Surgery 19315244 Translational Research 13646613 Trends in Cognitive Sciences 14714914 Trends in Molecular Medicine 26441099 Vaccine 1939459 Western Journal of Nursing Research 90866599 Xenotransplantation