title: Most Common Publication Types in Radiology Journals:: What is the Level of Evidence?
abstract: OBJECTIVE
  This study aimed to assess the most common publication types in radiology journals, as well as temporal trends and association with citation frequency.
  
  
  METHODS
  PubMed was searched to extract all published articles having the following "Publication Type" indices: "validation studies," "meta-analysis," "clinical trial," "comparative study," "evaluation study," "guideline," "multicenter study," "randomized study," "review," "editorial," "case report," and "technical report." The percentage of articles within each category published within clinical radiology journals was computed. Normalized percentages for each category were also computed on an annual basis. Citation counts within a 2-year window following publication were obtained using Web of Science. Overall trends were assessed.
  
  
  RESULTS
  Publication types with the highest fraction in radiology journals were technical reports, evaluation studies, and case reports (4.8% to 5.8%). Publication types with the lowest fraction in radiology journals were randomized trials, multicenter studies, and meta-analyses (0.8% to 1.5%). Case reports showed a significant decrease since 1999, with accelerating decline since 2007 (P = 0.002). Publication types with highest citation counts were meta-analyses, guidelines, and multicenter studies (8.1 ± 10.7 to 12.9 ± 5.1). Publication types with lowest citation counts were case reports, editorials, and technical reports (1.4 ± 2.4 to 2.9 ± 4.3). The representation in radiology journals and citation frequency of the publication types showed weak inverse correlation (r = -0.372).
  
  
  CONCLUSIONS
  Radiology journals have historically had relatively greater representation of less frequently cited publication types. Various strategies, including methodological training, multidisciplinary collaboration, national support networks, as well as encouragement of higher level of evidence by funding agencies and radiology journals themselves, are warranted to improve the impact of radiological research.
authors.affiliation: Department of Radiology, Center for Biomedical Imaging, NYU School of Medicine, NYU Langone Medical Center, 660 First Avenue, 3rd Floor, New York, NY 10016. Electronic address: andrew.rosenkrantz@nyumc.org.
authors.forename: Andrew B
authors.initials: AB
authors.lastname: Rosenkrantz
authors.affiliation: Department of Radiology, Center for Biomedical Imaging, NYU School of Medicine, NYU Langone Medical Center, 660 First Avenue, 3rd Floor, New York, NY 10016.
authors.forename: Niveditha
authors.initials: N
authors.lastname: Pinnamaneni
authors.affiliation: Department of Radiology, Center for Biomedical Imaging, NYU School of Medicine, NYU Langone Medical Center, 660 First Avenue, 3rd Floor, New York, NY 10016.
authors.forename: James S
authors.initials: JS
authors.lastname: Babb
authors.affiliation: Department of Radiology, Center for Biomedical Imaging, NYU School of Medicine, NYU Langone Medical Center, 660 First Avenue, 3rd Floor, New York, NY 10016.
authors.forename: Ankur M
authors.initials: AM
authors.lastname: Doshi
mesh_terms: D015706:Bibliometrics; D005069:Evaluation Studies as Topic; D006801:Humans; D008499:Medical Records / Q000706:statistics & numerical data; D015201:Meta-Analysis as Topic; D015337:Multicenter Studies as Topic / Q000706:statistics & numerical data; D010506:Periodicals as Topic / Q000706:statistics & numerical data*; D017410:Practice Guidelines as Topic; D011643:Publishing / Q000706:statistics & numerical data; D011871:Radiology / Q000706:statistics & numerical data*; D016032:Randomized Controlled Trials as Topic / Q000706:statistics & numerical data; D013679:Technology, Radiologic / Q000706:statistics & numerical data