title: Worldwide research productivity in the field of psychiatry.
abstract: BACKGROUND
  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.
  
  
  METHODS
  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.
  
  
  RESULTS
  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.
  
  
  CONCLUSIONS
  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.
authors.affiliation: Department of Psychiatry, Tianjin Anding Hospital (Tianjin City Mental Health Center), Tianjin, China.|Graduate School, Tianjin Medical University, Tianjin, China.
authors.forename: Jinghua
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Department of Psychiatry, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin, China.
authors.forename: Xiaoou
authors.initials: X
authors.lastname: Chen
authors.affiliation: Department of Psychiatry, Tianjin Anding Hospital (Tianjin City Mental Health Center), Tianjin, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Gao
authors.affiliation: Department of Psychiatry, Tianjin Anding Hospital (Tianjin City Mental Health Center), Tianjin, China.
authors.forename: Huizeng
authors.initials: H
authors.lastname: Yang
authors.affiliation: Guang'anmen Hospital, China Academy of Chinese Medical Sciences, No. 5 BeiXianGe St., XiCheng District, Beijing, 100053 China.
authors.forename: Zhong
authors.initials: Z
authors.lastname: Zhen
authors.affiliation: Guang'anmen Hospital, China Academy of Chinese Medical Sciences, No. 5 BeiXianGe St., XiCheng District, Beijing, 100053 China.
authors.forename: Qingwei
authors.initials: Q
authors.lastname: Li
authors.affiliation: Guang'anmen Hospital, China Academy of Chinese Medical Sciences, No. 5 BeiXianGe St., XiCheng District, Beijing, 100053 China.
authors.forename: Yiqun
authors.initials: Y
authors.lastname: Lin
authors.affiliation: Guang'anmen Hospital, China Academy of Chinese Medical Sciences, No. 5 BeiXianGe St., XiCheng District, Beijing, 100053 China.
authors.forename: Xiyan
authors.initials: X
authors.lastname: Zhao
keywords: Citation; Literature; Productivity; Psychiatry