Table 3 Thematic categories covered by the checklists (oldest to most recently published)

 [REFERENCE CHECKLIST] Shamseer, 2017 [13]

X

X

X

X

X

X

 Beall, 2012 [10]

X

X

X

X

X

X

 Beall, 2013 [15]

X

X

X

X

 Crawford, 2014 [82]

X

X

X

 Knoll, 2014 [83]

X

X

X

X

X

 Lukic, 2014 [84]

X

X

X

X

 Beall, 2015 [85]

X

X

X

X

X

X

 Bhad, 2015 [86]

X

X

X

X

 Bradley-Springer, 2015 [87]

X

X

 Hemmat Esfe, 2015 [88]

X

X

X

X

 INANE Predatory Publishing Practices Collaborative, 2015 [89]

X

X

X

 Pamukcu Gunaydin, 2015 [90]

X

X

X

X

 Proehl, 2015 [91]

X

X

X

 Stone, 2015 [92]

X

X

X

 Yucha, 2015 [93]

X

X

X

 Cariappa, 2016 [94]

X

X

X

X

 Carroll, 2016 [95]

X

X

X

 Dadkhah, 2016 [96]

X

X

X

X

X

 Fraser, 2016 [97]

X

X

X

X

 Glick, 2016 [98]

X

X

X

X

 Glick, 2016a [99]

X

X

X

X

 Hansoti, 2016 [100]

X

X

X

X

 Morley, 2016 [101]

X

X

X

X

 Nolan, 2016 [102]

X

X

X

X

 Ward, 2016 [103]

X

X

X

X

X

X

 Abadi, 2017 [16]

X

X

X

X

X

X

 Balehegn, 2017 [30]

X

 Berger, 2017 [17]

X

X

X

X

X

 Das, 2017 [18]

X

X

X

X

 Erfanmanesh, 2017 [19]

X

X

X

X

X

X

 Eriksson, 2017 [20]

X

X

X

X

X

X

 Janodia, 2017 [21]

X

X

X

 Khan, 2017 [22]

X

X

X

X

X

 Klyce, 2017 [23]

X

X

X

X

X

 Manca, 2017 [24]

X

X

X

X

 Miller, 2017 [25]

X

X

X

 Misra, 2017 [26]

X

X

X

X

X

X

 Mouton, 2017 [27]

X

X

X

X

 Oren, 2017 [28]

X

X

X

X

 Shamseer, 2017 [13]

X

X

X

X

X

X

 Stratton, 2017 [29]

X

X

X

X

 Ajuwon, 2018 [33]

X

X

X

X

X

 Bowman, 2018 [34]

X

X

X

X

X

X

 Gerberi, 2018 [35]

X

X

X

 Kokol, 2018 [37]

X

 Lewinski, 2018 [38]

X

X

X

X

 McCann, 2018 [31]

X

X

X

X

X

 Memon, 2018 [39]

X

X

X

X

 Nnaji, 2018 [40]

X

X

X

X

X

X

 O’Donnell, 2018 [32]

X

X

X

X

X

X

 Pamukcu Gunyadin, 2018 [36]

X

X

X

X

 Power, 2018 [41]

X

X

X

X

X

 Richtig, 2018 [42]

X

X

X

X

X

X

 Wikipedia 2019 [104]

X

X

X

X

TOTALS /53 checklists from electronic journal databases (n, %)

47, 89

24, 45

45, 85

42, 79

34, 64

34, 64

 Carlson, 2014 [43]

X

X

 Clark, 2015 [1]

X

X

X

X

 University of Edinburgh, 2015 [44]

X

X

 Africa Check, 2017 [45]

X

X

X

 Cabell’s – Clarivate, 2017 [46]

X

X

X

X

X

X

 Duke University Medical Center, 2017 [47]

X

X

X

X

X

 University of Calgary, 2017 [48]

X

X

X

X

 Coopérer en information scientifique et technique, 2018 [49]

X

X

X

X

X

 Eaton, University of Calgary, 2018 [50]

X

X

X

X

 Lapinksi, Harvard, 2018 [51]

X

 Sorbonne Université, 2018 [52]

X

X

X

X

X

 University of Alberta, 2018 [54]

X

X

X

X

 University of British Columbia, 2018 [53]

X

X

X

X

X

X

 University of Toronto Libraries, 2018 [55]

X

X

X

X

X

X

 Dalhousie University, 2019 [56]

X

X

X

X

 McGill University, 2019 [57]

X

X

X

X

 McMaster University, 2019 [58]

X

X

X

X

X

 Prater, 2019 [59]

X

X

X

X

 Ryerson University Library, 2019 [60]

X

X

X

X

X

 Université Laval, 2019 [61]

X

X

X

X

X

 University of Cambridge, 2019 [62]

X

X

X

X

X

X

 University of Pretoria, 2019 [63]

X

X

X

X

X

 University of Queensland Library, 2019 [65]

X

X

X

X

X

 University of Queensland Library, 2019a [64]

X

X

X

X

 University of Witwatersrand, 2019 [66]

X

X

X

X

X

X

 Canadian Association of Research Libraries, ND [67]

X

X

X

X

X

X

 Columbia University Libraries, ND [68]

X

X

 Technion Library, ND [69]

X

X

X

 UC Berkley, ND [70]

X

X

X

X

 University of Ottawa Scholarly Communication, ND [71]

X

X

X

X

Totals /30 checklists from university library websites (n, %)

29, 97

12, 40

23, 77

21, 70

20, 67

24, 80

 Robbins S. Western Sydney University, 2015 [72]

X

X

X

X

 Attia, 2017 [73]

X

X

X

 Kysh, USC Keck School of Medicine, 2017 [74]

X

X

X

X

 McKenna, Rhodes University, 2017 [75]

X

X

X

 Nicholson, University of Witwatersrand, 2017 [76]

X

X

X

X

X

X

 Raszewski 2017 [77]

X

X

X

 Seal-Roberts, Springer Healthcare, 2017 [78]

X

X

X

X

 Menon, SCMS Group of Educational Institutions, India and Berryman, Cabells, 2018 [79]

X

X

X

X

X

 Office of Scholarly Communication, Cambridge University, 2018 [80]

X

X

X

X

X

 Weigand, 2018 UNC Libraries [81]

X

X

X

Totals /10 checklists from YouTube (n, %)

9, 90

3, 30

9, 90

8, 80

7, 70

4, 40

TOTAL (n, %)

85, 91

39, 42

77, 83

71, 93

61, 66

62, 67