There is an increased focus on the outcomes of Health Science PhD-education, particularly if PhD-graduates remain active in research. There is a gap in our knowledge about the extent the investment in Health Science PhDs is moving science forward and no definition of expected investment return from PhD exists. We explore the research production of Danish Health Science PhDs, 5–9 years post PhD-defence, to find the fraction of PhD-graduates that are still actively publishing internationally. Secondary endpoints include analyses of the number of publications over time, identification of consecutive publishers, gender differences, and differences between medical doctors with a PhD (MDs) and non-MDs with a PhD. PhD-theses defended in 2005 and 2006 were identified and collected using the Danish National Research Database and via the four Danish universities offering Health Science PhD-programmes. Publication data were collected from Years 5 to 9 post PhD-defence to allow publications produced during the PhD-period to be washed out. Total 532 unique PhD-graduates (300 female and 232 male) produced a total of 4,530 PubMed-indexed publications. Results show zero publishers represented 31.2% (n = 166), while 25.8% (n = 137) of PhD-graduates published 10 or more publications during the 5-year observation window. Overall publication count increased from post PhD Years 5–9 with 68% (from 720 to 1,049). Number of publications did not differ between MDs and non-MDs. Our results evidence that not all graduates continue in research. Consequently, we need to identify early factors that make graduates remain in research, to identify future PhD-candidates that will continue publication post PhD.

中文翻译：

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国防科学博士后五年，由卫生科学博士学位继续出版

人们越来越关注卫生科学博士学位教育的成果，特别是如果博士学位毕业生仍活跃于研究领域。我们对健康科学博士学位的投资在多大程度上推动科学发展方面的知识方面还存在空白，并且没有关于博士学位预期投资回报的定义。我们研究了在国防博士学位后5-9年的丹麦卫生科学博士学位的研究成果，以发现仍在国际上积极发表论文的博士生所占的比例。次要终点包括对一段时间内出版物数量的分析，连续出版者的识别，性别差异以及具有博士学位（MDs）的医学博士与具有博士学位的非MDs之间的差异。使用丹麦国家研究数据库以及提供卫生科学博士学位计划的四所丹麦大学，确定并收集了2005年和2006年获得辩护的博士学位论文。在博士后5年到9年收集出版物数据，以便淘汰在博士期间产生的出版物。共有532名独特的博士生（300名女性和232名男性）制作了4,530种PubMed索引的出版物。结果显示，在5年观察期内，有0个出版者占31.2％（n = 166），而有25.8％（n = 137）的博士生发表了10个或更多的出版物。总体出版数量从博士后5-9年增加了68％（从720增至1,049）。MD和非MD的出版物数量没有差异。我们的结果证明并非所有毕业生都在继续研究。所以，