Worldwide research productivity in the field of psychiatry
- Jinghua Zhang†1, 2,
- Xiaoou Chen†3,
- Xin Gao1,
- Huizeng Yang1,
- Zhong Zhen4,
- Qingwei Li4,
- Yiqun Lin4 and
- Xiyan Zhao4Email author
© The Author(s) 2017
Received: 22 November 2016
Accepted: 10 February 2017
Published: 14 February 2017
The field of psychiatry has seen significant progress in recent years due to worldwide contributions. National productivity, however, in the field of psychiatry is still unclear. In our study, we investigated contributions of individual nations to the field of psychiatry.
The Web of Science was used to perform a search from 2011 to 2015 on the subject category “psychiatry”. The total number of articles, citations and the per capita numbers were obtained to analyze the contributions of different countries.
In psychiatry journals from 2011 to 2015, 84,760 articles were published worldwide. The most productive world areas were North America, East Asia, Europe and Oceania. The percentage of articles published in high-income countries was 87.77%, middle-income countries published 12.07%, and lower-income published 0.16%. Most articles were published by the United States (32.68%); the United Kingdom was next (8.59%), which was followed by Germany (6.77%), Australia (5.87%), and Canada (4.9%). The country with the highest number of citations (243,394) was the United States. A positive correlation was found between the population/GDP and the number of publications (P < 0.01). Australia ranked the highest when normalized to population size, and the Netherlands and Norway were next. The Netherlands ranked highest, followed by Israel and Australia when adjusted for GDP.
The authorship of most of the psychiatry articles was from high-income countries and few papers came from low-income countries. The most productive country was the United States. However, when normalized to population size and GDP, some European and Oceania countries were most productive.
KeywordsPsychiatry Productivity Literature Citation
The field of psychiatry has grown significantly in recent years. The dramatic progress in the care of psychiatric disorders can be attributed to contributions worldwide. It is obvious that the scientific contributions to psychiatry should not be the same throughout the world since different countries have different healthcare systems, scientific programs and financial supports [1, 2].
An important process in scientific research is publication of research studies and publications are important for the advancement of psychiatry. An indicator of scientific productivity is the number of articles published. Also, analysis of national productivity can be used to identify tendency in scientific publications. The importance of papers is also a measure of scientific productivity . Assessment of national representation has also been carried out in recent years in several medical fields including endocrinology and metabolism , rheumatology , emergency medicine , critical care medicine , stroke research , tuberculosis , infectious disease , nutrition and dietetics , cardiovascular disease , spine surgery , surgical oncology , foot and ankle research , arthroscopy , the hand and wrist literature , neurosurgery , and radiology .
In the field of psychiatry, Igoumenou et al.  had analyzed the geographic trends of scientific output and the characteristics of citations using the articles published between 2004 and 2009. However, they did not investigate all the countries worldwide contributed to the field of psychiatry. Moreover, the relationship between the research productivity of countries and their population size and economic status was also not analyzed in their study . Therefore, it is necessary to establish the current worldwide research productivity in psychiatry. We performed an analysis to investigate the national research output in various countries worldwide in psychiatry journals from 2011 to 2015.
The Journal Citation Reports (JCR) was established by the Institute for Scientific Information . In the JCR subject category “psychiatry” for the year 2015, there were 197 journals listed and these journals were included in our study (Additional file 1).
The Web of Science database was used for a computerized search in July 2016. Web of Science was chosen because it stores citations and other scholastic influence information, it is considered the leading database, and it has been used in similar types of studies [3, 4, 6, 9, 13–16]. We identified articles published in the 197 journals from January 2011 to December 2015. We only included original articles and reviews. We excluded letters, editorial material and corrections. Titles of the journals were used for the search. The country of the correspondence was taken as the source country for all articles.
The number of papers was used as the indicator of quantity for scientific productivity. The quality indicator was the total number of citations. The number of papers from the countries were the primary outcomes of our study. The countries were ranked according to the number of articles produced. The proportions of articles for high income, upper-middle income, lower-middle income, and low income countries were determined according to the income categories of the World Bank . Gross National Income was used for categorization as well, which was high income ($12,746 or more), upper-middle income ($4126–$12,745), lower-middle income ($1046–$4125), and low income ($1045 or less) .
Next, we investigated the papers from the most productive countries; that is, those publishing at least 1% of the total number of papers, incorporating the total number, per capita number, total citations (the number of papers multiplied by their citations) and the mean number of citations. The most recent report from the Central Intelligence Agency was used to determine the population size in each country . The list of journals that had articles published from the top five countries was collected and the top 5 journals of these were noted.
The aim of this study was not to investigate the relative contributions among countries, so descriptive statistics; i.e., sums or averages, were calculated to describe the trends in publication. A Spearman’s test was used to determine the statistical significance of the correlations [3, 6, 14–16]. SPSS 19.0 (SPSS Inc., Chicago, IL, USA) was used for the statistical tests. P < 0.05 was noted to be statistically significant. StatPlanet software (StatSilk, Sydney, NSW 2089, Australia) was used to create the world map.
Using the database of the Web of Science, we identified the number of papers published in psychiatry for the years 2011–2015. The total number was 84,760. A total of 14,902 papers were reported in 2011, and 18,744 papers were produced in 2015. This represented a 1.26-fold increase between 2011 and 2015.
Publications in the most productive countries from 2011 to 2015
N per million population
N per 10 billion US $ GDP
Australia had the most articles per million population (220.99), followed by the Netherlands (200.45), and Norway (195.04). The Netherlands ranked the highest (42.28), followed by Israel (34.56), and Australia (31.87) after adjustment for GDP. The United States, China, and Japan, which are countries with large economies, ranked relatively low when adjusted by GDP.
Ranking journals in the top 5 countries
United States (27703)
Drug Alcohol Depend (1227)
Psychol Med (345)
Australasian Psychiatry (439)
Can J Psychiatry (304)
Br J Psychiatry (280)
Fortschr Neurol Psychiatr (309)
Aust N Z J Psychiatry (341)
J Affect Disord (139)
Psychiatric Services (790)
J Affect Disord (267)
Psychiatrische Praxis (239)
J Affect Disord (274)
Schizophr Res (131)
J Neurol Neurosurg Psychiatry (253)
Eur Arch Psychiatry Clin Neurosci (191)
Psychiatr Psychol Law (182)
Psychiatry Res (123)
Schizophr Res (691)
J Psychopharmacol (216)
Prax Kinderpsychol Kinderpsychiatr (179)
Int J Ment Health Nurs (154)
Top 5 countries in the top 5 journals
J Affect Disord (3086)
Psychiatry Res (2621)
Schizophr Res (1853)
Drug Alcohol Depend (1824)
United States (643)
United States (622)
United States (837)
United States (691)
United States (1227)
United Kingdom (186)
United Kingdom (267)
United Kingdom (74)
United Kingdom (161)
United Kingdom (116)
The field of psychiatry has evolved recently, and this can be explained by the great development in science and technology, especially the worldwide scientific contributions of psychiatry researchers. Scientific publications are key indicators of research productivity as well as promoters of the expansion of new knowledge. Worldwide research productivity in several biomedical fields has been evaluated in many recent studies [3–18]. In our study, we evaluated worldwide research productivity in psychiatry from 2011 to 2015.
The results from our study indicated that the United States had more papers than any other country. Therefore, it can be said that the United States plays an important role in psychiatry research. It is well known that the United States has been the most prolific country in many medical fields for several decades. In addition to the field of psychiatry, the United States has been the most productive in many other areas of biomedical research [3, 5, 6, 14–16]. This result is similar with the study from Igoumenou et al. . It indicated that the United States had also been leading the research productivity in psychiatry for many years. However, the other countries, such as Germany and the United Kingdoms, may not keep their ranks when compared with their publication activity in the past years .
The United States also has the most citations (243,394) in the field of psychiatry and the second highest mean number of citations (8.79), which suggests that the publications reported by the United States were not only high in number but were also of high quality. Our results indicated that, overall, the United States was the most prolific country in psychiatry.
A “10/90” divide describes the proportions of non-high and high income countries in many medical fields and this can be considered when analyzing the contributions of different countries [3, 5, 6, 23]. A slightly higher proportion, however, was observed for middle income countries in the present study. It may be because of the contributions of China, Turkey, and Brazil, which were productive middle income countries . These countries have been shown to have increasing importance in biomedical research [3, 5, 24, 25]. This is suggestive of the significant development of the societies and economies of these middle-income countries [3, 5]. Rapid economic development in these countries could further improve productivity in psychiatry research and their rank in future studies will be higher. In addition, low research productivity in psychiatry in low income countries was found with only 135 articles identified. A combination of factors may contribute to this, such as medical infrastructures, research characteristics, government policies, and research funding [3, 23].
Australia, the Netherlands, and Norway were more prolific when adjusted by population size. The Netherlands, Israel, and Australia were most prolific with the largest number of papers per capita when normalized to GDP. The most productive countries were nearly all considered as developed countries. Clearly, it may make most sense to normalize, not population size, but by the number of researchers in the countries. It is difficult, though, to determine the number of researchers in psychiatry in each country.
The most popular journals in the United States, United Kingdom, Germany, Australia, and Canada, were Drug and Alcohol Dependence, Psychological Medicine, Nervenarzt, Australasian Psychiatry and the Canadian Journal of Psychiatry-Revue Canadienne De Psychiatrie, respectively. Of note, all of these journals are published in the respective countries. It is possible that more submissions come from countries where the journals are located than from other countries. Also, the United States and the United Kingdom appeared 5 times in the top 5 countries in the top 5 journals. This suggests the impact of these countries in psychiatry researches.
This study had limitations. First, JCR were done to identify journals for this study. Papers reported in non-JCR-cited journals may have contributed to scientific productivity but not included. Second, because only English language journals were incorporated, there may have been a language bias in the journal sources. Third, journals were identified under the “psychiatry” category; however, there may have been articles in the basic science and general internal medicine journals that were not targets of the search. However, the 197 psychiatry journals included in this analysis are likely the most important journals in the field of psychiatry. Fourth, self-citation was not investigated in this study. It may influence the citation index and magnify the importance or popularity of the papers.
In our study, we evaluated research productivity in the field of psychiatry of various nations throughout the world over a 5-year recent period. Our results showed that most papers came from high income countries and there were fewer publications from low income countries. The most prolific country in psychiatry was the United States. Some European and Oceania countries, however, were most prolific when adjusted by population size and GDP.
gross domestic product
Journal Citation Reports
XZ, JZ and XC designed the study and modified the article. ZX, XG and HY carried out data analysis, and JZ, XC, ZZ, QL, YL collected all the data. All authors had final approval of the submitted and published versions. All authors read and approved the final manuscript.
We thank Zhiwei Jia from the 306th Hospital of People’s Liberation Army, Beijing, China, to modify the manuscript.
The authors declare that they have no conflicts of interest.
Availability of data and materials
Data are available from the authors upon reasonable request.
Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
- Langer A, Diaz-Olavarrieta C, Berdichevsky K, Villar J. Why is research from developing countries underrepresented in international health literature, and what can be done about it? Bull World Health Organ. 2004;82(10):802–3.PubMedPubMed CentralGoogle Scholar
- Rahman M, Fukui T. Biomedical research productivity: factors across the countries. Int J Technol Assess Health Care. 2003;19(1):249–52.View ArticlePubMedGoogle Scholar
- Zhao X, Ye R, Zhao L, Lin Y, Huang W, He X, Lian F, Tong X. Worldwide research productivity in the field of endocrinology and metabolism—a bibliometric analysis. Endokrynol Pol. 2015;66(5):434–42.View ArticlePubMedGoogle Scholar
- Cheng T, Zhang G. Worldwide research productivity in the field of rheumatology from 1996 to 2010: a bibliometric analysis. Rheumatology (Oxford). 2013;52(9):1630–4.View ArticleGoogle Scholar
- Li Q, Jiang Y, Zhang M. National representation in the emergency medicine literature: a bibliometric analysis of highly cited journals. Am J Emerg Med. 2012;30(8):1530–4.View ArticlePubMedGoogle Scholar
- Li Z, Qiu LX, Wu FX, Yang LQ, Sun YM, Lu ZJ, Yu WF. Assessing the national productivity in subspecialty critical care medicine journals: a bibliometric analysis. J Crit Care. 2012;27(6):741–7.View ArticleGoogle Scholar
- Chow DS, Hauptman JS, Wong TT, Gonzalez NR, Martin NA, Lignelli AA, Itagaki MW. Changes in stroke research productivity: a global perspective. Surg Neurol Int. 2012;3:27.View ArticlePubMedPubMed CentralGoogle Scholar
- Sweileh WM, Abutaha AS, Sawalha AF, Al-Khalil S, Al-Jabi SW, Zyoud SH. Bibliometric analysis of worldwide publications on multi-, extensively, and totally drug-resistant tuberculosis (2006–2015). Multidiscip Respir Med. 2016;11:45.View ArticlePubMedGoogle Scholar
- Sweileh WM, Al-Jabi SW, Abuzanat A, Sawalha AF, Abutaha AS, Ghanim MA, Zyoud SH. Assessment of research productivity of Arab countries in the field of infectious diseases using Web of Science database. Infect Dis Poverty. 2015;4(1):2.View ArticlePubMedPubMed CentralGoogle Scholar
- Sweileh WM, Al-Jabi SW, Sawalha AF, Zyoud SH. Bibliometric analysis of nutrition and dietetics research activity in Arab countries using ISI Web of Science database. Springerplus. 2014;3:718.View ArticlePubMedPubMed CentralGoogle Scholar
- Al-Kindi S, Al-Juhaishi T, Haddad F, Taheri S, Abi KC. Cardiovascular disease research activity in the Middle East: a bibliometric analysis. Ther Adv Cardiovasc Dis. 2015;9(3):70–6.View ArticlePubMedGoogle Scholar
- Wei M, Wang W, Zhuang Y. Worldwide research productivity in the field of spine surgery: a 10-year bibliometric analysis. Eur Spine J. 2016;25(4):976–82.View ArticlePubMedGoogle Scholar
- Bakker IS, Wevers KP, Hoekstra HJ. Geographical distribution of publications in the scientific field of surgical oncology. J Surg Oncol. 2013;108(8):505–7.View ArticlePubMedGoogle Scholar
- Luo X, Liang Z, Gong F, Bao H, Huang L, Jia Z. Worldwide productivity in the field of foot and ankle research from 2009 to 2013: a bibliometric analysis of highly cited journals. J Foot Ankle Res. 2015;8:12.View ArticlePubMedPubMed CentralGoogle Scholar
- Liang Z, Luo X, Gong F, Bao H, Qian H, Jia Z, Li G. Worldwide research productivity in the field of arthroscopy: a bibliometric analysis. Arthroscopy. 2015;31(8):1452–7.View ArticlePubMedGoogle Scholar
- Mei X, Zhu X, Zhang T, Jia Z, Wan C. Worldwide productivity in the hand and wrist literature: a bibliometric analysis of four highly cited subspecialty journals. Int J Surg. 2016;28:8–12.View ArticlePubMedGoogle Scholar
- Hauptman JS, Chow DS, Martin NA, Itagaki MW. Research productivity in neurosurgery: trends in globalization, scientific focus, and funding. J Neurosurg. 2011;115(6):1262–72.View ArticlePubMedGoogle Scholar
- Chow DS, Ha R, Filippi CG. Increased rates of authorship in radiology publications: a bibliometric analysis of 142,576 articles published worldwide by radiologists between 1991 and 2012. Am J Roentgenol. 2015;204(1):W52–7.View ArticleGoogle Scholar
- Igoumenou A, Ebmeier K, Roberts N, Fazel S. Geographic trends of scientific output and citation practices in psychiatry. BMC Psychiatry. 2014;14:332.View ArticlePubMedPubMed CentralGoogle Scholar
- Institute for Scientific Information ISI Journal Citation Reports 2013. http://isiknowledge.com. Accessed 7 2016.
- World Bank Data Development Group World Bank list of economies. http://data.worldbank.org/about/country-classifications/countryand-lending-groups. Accessed 7 2016.
- Central Intelligence Agency The world factbook. https://www.cia.gov/library/publications/the-world-factbook/. Accessed 7 2016.
- Saxena S, Paraje G, Sharan P, Karam G, Sadana R. The 10/90 divide in mental health research: trends over a 10-year period. Br J Psychiatry. 2006;188:81–2.View ArticlePubMedGoogle Scholar
- Tong D, Wang L, Jiang J. Publications from China in The Lancet, NEJM, and JAMA. Lancet. 2013;381(9882):1983.View ArticlePubMedGoogle Scholar
- Cyranoski D. China increases share of global scientific publications. Nature. 2004;431(7005):116.View ArticlePubMedGoogle Scholar