Table 1

Reviewer subgroups and their characteristics

Subgroup, based on shares of predatory reviews per reviewerNumber of reviewers (% of all 7349 reviewers)Mean academic age (SD)Mean number of reviews per reviewer (SD)Mean number of publications per reviewer (SD)Reviews written per year per reviewer (SD)Articles published per year per reviewer (SD)
No predatory reviews (0%)6611 (90.0)15.27 (10.3)46 (77.9)57.28 (73.7)3.65 (6.8)3.25 (3.7)
Few predatory reviews (1%–25%)555 (7.6)17.37 (11.4)132.3 (153.6)85.39 (119.1)9.9 (19.3)4.43 (3.9)
Some predatory reviews (26%–75%)138 (1.9)12.47 (10.4)107.8 (174.0)49.58 (75.3)10.60 (19.6)3.42 (3.3)
Many predatory reviews (76%–99%)19 (0.26)8.16 (6.5)236.6 (401.2)43.53 (75.7)36.71 (60.3)5.29 (12.9)
Predatory reviews only (100%)26 (0.35)9.38 (6.3)26.35 (40.8)18 (14.5)3.34 (5.6)1.91 (1.2)