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To protect appropriate authorship, the International Committee of Medical Journal Editors (ICMJE) formulated a guideline on authorship. Researchers not fulfilling these criteria and still enlisted as author are seen as honorary authors (HA). The objective of this study is to assess authorship decision making and the proportion of HA in journals in the field of geriatrics and gerontology. Corresponding authors of six highimpact journals in geriatrics and gerontology were sent a survey. The survey consisted of three parts: i) demographics of the respondent; ii) awareness of authorship guidelines; and iii) authorship decisions made for the paper they are authors of. Respondents were also asked if one of their coauthors does not deserve authorship. This is defined as self-perceived HA. Furthermore, respondents were asked if any of their co-authors only performed tasks from a list of non-authorship tasks. This is defined as ICMJE-defined HA. Of the 1592 contacted authors, 528 filled in a survey (response rate 33.2%). 84.4% was aware of the ICMJE-guidelines, but 44.2% was unaware of the issue of HA. The proportion of self-perceived HA was 12.7%. Independent factors associated with more self-perceived HA were having a senior member automatically enlisted as coauthor [odds ratio (OR) 3.4, 95%confidence interval (CI) 1.8 to 6.4] and have gotten the suggestion to include an HA (OR 11.1, 95% CI 4.4 to 27.9). The proportion of ICMJEdefined HA was 39.3%. The journal surveyed (OR 1.2, 1.0 to 1.3) was associated with more, and awareness of the ICMJE (OR 0.5, 95% CI 0.3 to 0.9) was associated with less ICMJE-defined HA respectively. Having a senior member automatically enlisted as co-author (OR 2.1 95% CI 1.3 to 3.4) and having anyone suggest to include an HA (OR 4.8 95% CI 1.8 to 12.8) were also associated with more ICMJE-defined HA. More than one out of ten of the corresponding authors thinks that based on the ICMJE-guidelines, one or more of their coauthors did not deserve authorship. A stricter journal policy and more awareness of the ICMJE-guidelines could help reduce the proportion of HA.

Honorary authorship in Geriatric Literature: do authors adhere to the ICMJE-guidelines?