Table 2.

Authorship Contributions (n = 2,927)

Contribution	No.	%
Conception and design	1,101	38
Financial support	92	3
Administrative support	389	13
Provision of study materials or patients	1,870	64
Collection and assembly of data	1,387	47
Data analysis and interpretation	1,340	46
Manuscript writing	1,176	40
Final approval of the manuscript	2,324	79
Any key role*	1,881	64
Fulfills ICMJE authorship criteria†	1,760	60

Abbreviation: ICMJE, International Committee of Medical Journal Editors.

^*Coded as yes if the author reported involvement in conception and design, data analysis and interpretation, or manuscript writing.

^†Coded as yes if the author participated in conception and design, or collection and assembly of data, or analysis and interpretation of data; and the author gave final approval of the manuscript. ICMJE requirements for authorship also include a third criterion, drafting of the manuscript or critical revision of the manuscript for important intellectual content. Because Journal of Clinical Oncology does not report critical revision of the manuscript as a separate role, all authors were given credit for this criterion in determining fulfillment of ICMJE authorship criteria.