UNLABELLED: OBJECTIVE; There is evidence in academic medicine that the number of authors per paper has increased over time. The goal of this study was to quantitatively analyze authorship trends in the field of radiology over 20 years. MATERIALS AND METHODS: A search of the National Library of Medicine MEDLINE database was conducted to identify articles published by radiology departments between 1991 and 2012. Country of origin, article study design, and journal impact factor were recorded. The increase in number of authors per paper was assessed by linear and nonlinear regression. Pearson correlation was used to assess the relation between journal impact factor and number of authors. RESULTS: A total of 142,576 articles and 699,257 authors were identified during the study period. The mean number of authors per paper displayed linear growth from 3.9 to 5.7 (p < 0.0001). The proportion of single authors declined from 11% in 1991 to 4.4% in 2012. The number of clinical trials increased in a linear pattern, review articles in an exponential pattern, and case reports in a logistic pattern (p < 0.0001 for each). Countries with the highest number of authors per paper were Japan, Italy, and Germany. The number of articles funded by the U.S. National Institutes of Health (NIH) displayed exponential growth and of non-NIH-funded articles displayed linear growth (p < 0.0001 for each). A negligible relation was observed between journal impact factor and number of authors (Pearson r = 0.1066). CONCLUSION: Radiology has had a steady increase in mean number of authors per paper since the early 1990s that has varied by study design. The increase is probably multi-factorial and includes components of author inflation and increasing complexity of research. Findings support the need for reemphasis of authorship criteria to preserve authorship value and accountability.
UNLABELLED: OBJECTIVE; There is evidence in academic medicine that the number of authors per paper has increased over time. The goal of this study was to quantitatively analyze authorship trends in the field of radiology over 20 years. MATERIALS AND METHODS: A search of the National Library of Medicine MEDLINE database was conducted to identify articles published by radiology departments between 1991 and 2012. Country of origin, article study design, and journal impact factor were recorded. The increase in number of authors per paper was assessed by linear and nonlinear regression. Pearson correlation was used to assess the relation between journal impact factor and number of authors. RESULTS: A total of 142,576 articles and 699,257 authors were identified during the study period. The mean number of authors per paper displayed linear growth from 3.9 to 5.7 (p < 0.0001). The proportion of single authors declined from 11% in 1991 to 4.4% in 2012. The number of clinical trials increased in a linear pattern, review articles in an exponential pattern, and case reports in a logistic pattern (p < 0.0001 for each). Countries with the highest number of authors per paper were Japan, Italy, and Germany. The number of articles funded by the U.S. National Institutes of Health (NIH) displayed exponential growth and of non-NIH-funded articles displayed linear growth (p < 0.0001 for each). A negligible relation was observed between journal impact factor and number of authors (Pearson r = 0.1066). CONCLUSION: Radiology has had a steady increase in mean number of authors per paper since the early 1990s that has varied by study design. The increase is probably multi-factorial and includes components of author inflation and increasing complexity of research. Findings support the need for reemphasis of authorship criteria to preserve authorship value and accountability.
Authors: Sirio Cocozza; Camilla Russo; Giuseppe Pontillo; Lorenzo Ugga; Antonio Macera; Amedeo Cervo; Maria De Liso; Nilde Di Paolo; Maria Isabella Ginocchio; Flavio Giordano; Giuseppe Leone; Giovanni Rusconi; Arnaldo Stanzione; Francesco Briganti; Mario Quarantelli; Ferdinando Caranci; Alessandra D'Amico; Andrea Elefante; Enrico Tedeschi; Arturo Brunetti Journal: Neuroradiology Date: 2016-11-08 Impact factor: 2.804
Authors: Long Jiang Zhang; Yun Fei Wang; Zhen Lu Yang; U Joseph Schoepf; Jiaqian Xu; Guang Ming Lu; Enzhong Li Journal: Eur Radiol Date: 2017-03-22 Impact factor: 5.315
Authors: Gregorio González-Alcaide; Jinseo Park; Charles Huamaní; Isabel Belinchón; José M Ramos Journal: PLoS One Date: 2015-12-11 Impact factor: 3.240
Authors: Fernando Alfonso; Parounak Zelveian; Jean Jacques Monsuez; Michael Aschermann; Michael Boehm; Alfonso Buendia Hernandez; Tzung Dau Wang; Ariel Cohen; Sebija Izetbegovic; Anton Doubell; Dario Echeverri; Nuray Enç; Ignacio Ferreira-González; Anetta Undas; Ulrike Fortmüller; Plamen Gatzov; Carmen Ginghina; Lino Goncalves; Addad Faouzi; Mahmoud Hassanein; Gerd Heusch; Kurt Huber; Robert Hatala; Mario Ivanusa; Chu Pak Lau; Germanas Marinskis; Livio Dei Cas; Carlos Eduardo Rochitte; Kjell Nikus; Eckart Fleck; Luc Pierard; Slobodan Obradović; María Del Pilar Aguilar Passano; Yangsoo Jang; Olaf Rødevand; Mikael Sander; Evgeny Shlyakhto; Çetin Erol; Dimitris Tousoulis; Dilek Ural; Jan J Piek; Albert Varga; Andreas J Flammer; François Mach; Alban Dibra; Faiq Guliyev; Alexander Mrochek; Mamanti Rogava; Ismael Guzman Melgar; Giuseppe Di Pasquale; Kanat Kabdrakhmanov; Laila Haddour; Zlatko Fras; Claes Held; Valentyn Shumakov Journal: Anatol J Cardiol Date: 2019-04 Impact factor: 1.596