Academia and Clinic Tables

Table 1.

Descriptive Statistics on the Lists of Researchers in Original Articles in The Lancet

Variable During Study Period Period before Implementation of Authorship Proposal 
Byline Acknowledgments List Contributors List Byline Acknowledgments List 
Persons listed ± SD (range), n 6.5 ± 3.5 (0-18) 5.4 ± 7.7 (0-47) 7.0 ± 3.6 (0-23) 6.0 ± 3.7 (0-17) 4.5 ± 8.9 (0-63)
Column length ± SD (range),cm 2.3 ± 1.5 (0.8-8.7) 2.5 ± 1.1 (1.1-7.8) 1.7 ± 1.3 (0.3-7.4)

Table 2.

Contributors List Categories in The Lancet*

Top 10 Overall Categories of Contribution(%) All Contributors (n=852) First on Byline (n=115) Second on Byline (n=110) Third on Byline (n=105) Last on Byline (n=115) 
Wrote paper 61.7 (11.4) 83.5 (46.1) 67.3 (14.5) 54.3 (2.9) 80.0 (20.0)
Designed study 40.4 (10.3) 58.3 (29.6) 44.5 (12.7) 38.1 (6.7) 52.2 (12.2)
Analyzed or interpreted data 31.5 (8.1) 51.3 (27.8) 38.2 (9.1) 25.7 (2.9) 32.2 (8.7)
Collected data 21.5 (4.2) 27.0 (7.8) 27.3 (5.5) 25.7 (8.6) 13.9 (3.5)
Coordinated study 19.7 (9.9) 42.6 (36.5) 14.5 (10.0) 15.2 (4.8) 17.4 (7.0)
Performed clinical analysis or management 15.1 (4.3) 11.3 (2.6) 14.5 (5.5) 19.0 (6.7) 11.3 (4.3)
Performed laboratory analysis 11.7 (5.3) 7.0 (4.3) 12.7 (6.4) 12.4 (2.9) 9.6 (5.2)
Performed statistical analysis 8.8 (5.0) 8.7 (6.1) 11.8 (8.2) 12.4 (7.6) 7.0 (3.5)
Advised on design or analysis 8.7 (-) 7.0 (-) 10.9 (-) 8.6 (-) 15.7 (-)
Managed data 6.2 (4.2) 5.2 (2.6) 10.9 (8.2) 11.4 (7.6) 1.7 (1.7)

* The numbers in parentheses indicate the percentage of contributors who fulfilled most of the activities in any one category (that is, the major subcategories).

Table 3.

Fulfillment of Modified Vancouver Group Authorship Criteria by Contributors on the Bylines of Original Research Articles in The Lancet

Criterion All Contributors on the Byline* (n=785) Contributors by Byline Placement Contributors to “Vancouver Caveat” Categories 
First (n=115) Second (n=110) Third (n=105) Last (n=115) Data Collection (n=158) Supervision (n=66) Funding (n=13) 
Participation in any of conception, design, analysis, or interpretation 77.5 80.0 80.0 80.0 77.4 81.0 80.3 100 
Participation in writing or critical revision of the paper 65.2 83.5 67.3 54.3 80.0 77.8 74.2 92.3
Participation in approving version to be published† 100 100 100 100 100 100 100 100
All criteria 55.9 71.3 60.0 46.7 68.7 64.6 63.6 92.3

* Contributors not named on the byline were not included in these analyses because the Vancouver Group criteria for authorship are meant to apply only to those named on the byline of papers.

† Percentages of participation are assumed.

Table 4.

Overlap between the Contributors and Acknowledgments Lists in The Lancet: Comparison of the Top 10 Categories*

Variable
Contributors List (n=852) Acknowledgments List (n=650)

Participation

Categories on both lists†
Wrote paper 61.7 5.4
Analyzed or interpreted data 31.5 3.4
Collected data 21.5 20.0
Performed clinical analysis or management 15.1 4.6
Performed statistical analysis 8.8 3.8
Advised on design or analysis 8.7 11.4
Managed data 6.2 6.8
Categories on contributors list only
Performed laboratory analysis 11.7 2.2‡
Designed study 40.4 NA
Coordinated study 19.7 NA
Categories on acknowledgments list only
Investigators 3.1‡ 6.6
General contributions NA 28.8
Names of persons only NA 5.2

* NA=not applicable because no comparable category existed.

† Contributions are listed with the contributors list category names but encompass the range of activities also reflected in the acknowledgments list categories.

‡ Not a top 10 category in its respective list but listed because it had a percentage of participation.