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Table 1 Number of articles with equal credit given to multiple authors in the five public health journals in 2004–2013

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

Year

Epidemiologic Reviews

Environmental Health Perspectives

International Journal of Epidemiology

Epidemiology

Annual Review of Public Health

2004

0/10 (0 %)

2/252 (<1 %)

1/130 (<1 %)

0/89 (0 %)

0/24 (0 %)

2005

0/10 (0 %)

4/310 (1.3 %)

1/139 (<1 %)

0/105 (0 %)

0/24 (0 %)

2006

0/11 (0 %)

4/343 (1.2 %)

1/145 (<1 %)

0/89 (0 %)

0/22 (0 %)

2007

0/12 (0 %)

6/304 (2.0 %)

2/128 (1.6 %)

0/94 (0 %)

0/22 (0 %)

2008

0/10 (0 %)

13/272 (4.8 %)

0/133 (0 %)

0/95 (0 %)

0/25 (0 %)

2009

1/11 (9.1 %)

15/303 (5.0 %)

6/141 (4.3 %)

0/109 (0 %)

0/21 (0 %)

2010

0/13 (0 %)

17/270 (6.3 %)

7/161 (4.3 %)

0/110 (0 %)

0/30 (0 %)

2011

0/13 (0 %)

15/288 (5.2 %)

6/121 (5.0 %)

0/92 (0 %)

0/26 (0 %)

2012

0/14 (0 %)

10/268 (3.7 %)

12/128 (9.4 %)

0/88 (0 %)

0/25 (0 %)

2013

0/13 (0 %)

12/208 (5.8 %)

11/133 (8.3 %)

6/101 (5.9 %)

0/24 (0 %)

Total

1/117 (<1 %)

98/2818 (3.5 %)

47/1359 (3.5 %)

6/972 (<1 %)

0/243 (0 %)

r, P value

r = 0.058, P = 0.873

r = 0.753, P = 0.012

r = 0.894, P = 0.000

r = 0.522, P = 0.122

  1. The numerator represents the number of articles with equal credit given to multiple authors: the denominator represents the total number of articles published in a certain year in that journal