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Table 2 Number of articles with equal credit given to multiple authors according to by-line position in 2004–2013

From: An emerging trend of equal authorship credit in major public health journals

By-line position of authors given equal credit Epidemiologic Reviews (n = 1) Environmental Health Perspectives (n = 98) International Journal of Epidemiology (n = 47) Epidemiology (n = 6) Total (n = 152)
First two authors 0 63 (64.3 %) 32 (68.1 %) 3 (50.0 %) 98 (64.5 %)
First three or more authors 0 5 (5.1 %) 3 (6.4 %) 1 (16.7 %) 9 (5.9 %)
Last two authors 0 13 (13.3 %) 5 (10.6 %) 2 (33.3 %) 20 (13.2 %)
First and last authora 1 (100 %) 4 (4.1 %) 4 (8.5 %) 0 9 (5.9 %)
First two and last two authors 0 3 (3.1 %) 1 (2.1 %) 0 4 (2.6 %)
Middle authors only 0 2 (2.0 %) 1 (2.1 %) 0 3 (2.0 %)
First three authors or more      
Last three authors or more 0 1 (1.0 %) 0 0 1 (0.7 %)
All authorsb 0 3 (3.1 %) 0 0 3 (2.0 %)
Others 0 4 (4.1 %) 1 (2.1 %) 0 5 (3.3 %)
  1. aFor articles with only two authors, we considered the authors as first author and last author
  2. bExcluded articles with only two authors