Misuse of co-authorship in Medical PhD Theses in Scandinavia: A Questionnaire Survey

Background: Several studies suggest that deviations from proper authorship practices are commonplace in medicine. The aim of this study was to explore experiences of and attitudes towards the handling of authorship in PhD theses at medical faculties in Denmark, Norway, and Sweden. Methods: Those who defended their PhD thesis at a medical faculty in Scandinavia during the second half of 2020 were offered, by e-mail, to participate in an online survey. Survey questions dealt with experiences of violations of the first three of the ICMJE authorship criteria and misuse of authorship order in the thesis articles, as well as respondents’ attitudes to these matters. Both questions with fixed response alternatives and questions with free-text responses were used. Quantitative data were analysed statistically using the Table functions in SPSS 25 and Chi-2 tests. Free-text responses were analysed qualitatively using manifest content analysis. Results: 287 valid questionnaires were returned (response rate: 34.1%). Almost half (46.0%) of the respondents reported that the ICMJE authorship criteria were not fully respected in at least one of the papers in their thesis, while a vast majority (96.7%) found it important that authorship is handled according to the ICMJE authorship criteria. 24.4% reported inadequate handling of authorship order in at least one paper. The qualitative results provide a wide spectrum of examples of how the ICMJE authorship criteria are circumvented. Conclusion: Despite increasing educational efforts to reduce deviations from good research practice at Scandinavian universities, the handling of authorship in medical papers remains problematic.