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. 2015 Jun 4;10(6):e0127362. doi: 10.1371/journal.pone.0127362

Table 1. Baseline: editorial boards of the five leading spine journals.

The Spine Journal (n = 108) Spine (n = 271) European Spine Journal (n = 235) Journal of Neurosurgery: Spine (n = 13) Journal of Spinal Disorders & Techniques (n = 89) Total Editorial Board Members (n = 716) Total unique individuals (n = 595)
Impact Factor, 2012* 3.355 2.159 2.133 1.978 1.767 n/a n/a
Proportion of editorial board members appearing in at least on of the other spine journals 50 (46%) 80 (30%) 36 (15%) 10 (77%) 43 (48%) 98 (14%) 98 (16%)
Degree n = 107 n = 270 n = 231 n = 13 n = 89 n = 710 n = 589
 Doctor of Medicine degree (MD) 92 (86%) 223 (83%) 191 (83%) 13 (100%) 86 (97%) 605 (85%) 499 (85%)
 Doctor of Philosophy degree (PhD) 22 (21%) 87 (33%) 120 (52%) 1 (7.7%) 13 (15%) 243 (34%) 213 (36%)
Continent of residence n = 108 n = 271 n = 235 n = 13 n = 89 n = 716 n = 595
 North America 99 (92%) 194 (72%) 33 (14%) 12 (93%) 77 (87%) 415 (58%) 322 (54%)
 Europe 0 (0%) 44 (16%) 174 (74%) 0 (0%) 5 (5.6%) 223 (31%) 207 (35%)
 Asia 3 (2.8%) 25 (9.2%) 14 (6.0%) 1 (7.7%) 6 (6.7%) 49 (6.8%) 42 (7.1%)
 Australia 1 (0.93%) 7 (2.6%) 5 (2.1%) 0 (0%) 1 (1.1%) 14 (2.0%) 13 (2.2%)
 South America 5 (4.6%) 1 (0.37%) 6 (2.6%) 0 (0%) 0 (0%) 12 (1.7%) 8 (1.3%)
 Africa 0 (0%) 0 (0%) 3 (1.3%) 0 (0%) 0 (0%) 3 (0.04%) 3 (0.50%)
Primary job function n = 100 n = 263 n = 219 n = 13 n = 88 n = 683 n = 564
 Spine surgeon 73 (73%) 186 (71%) 160 (73%) 13 (100%) 82 (93%) 514 (75%) 416 (74%)
 Other medical specialist 14 (14%) 28 (11%) 16 (7.3%) 0 (0%) 3 (3.4%) 61 (8.9%) 56 (9.9%)
 Non-physician healthcare provider 1 (1.0%) 12 (4.6%) 8 (3.7%) 0 (0%) 0 (0%) 21 (3.1%) 20 (3.5%)
 Researcher/Investigator 12 (12%) 31 (12%) 34 (15%) 0 (0%) 3 (3.4%) 80 (12%) 65 (12%)
 Other 0 (0%) 6 (2.3%) 1 (0.46%) 0 (0%) 0 (0%) 7 (1.0%) 7 (1.2%)

* Impact Factor for the year 2012 according to Journal Citation Reports, Thomson Reuters, 2013 [28].

Editorial board members as published on websites of the journals, January 2013 [2327].

only the traceable editorial board members are mentioned and used to calculate percentage per category