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Table 3 Time trends in basic and peer-review characteristics and processing times

From: A descriptive analysis of the characteristics and the peer review process of systematic review protocols published in an open peer review journal from 2012 to 2017

Year 2012 2013 2014 2015 2016 2017 Overall
(n = 21) (n = 56) (n = 92) (n = 106) (n = 124) (n = 145) (n = 544)
Number of protocols registered in PROSPERO, Absolute (%) 17 (80.1%) 42 (75.0%) 81 (88.0%) 93 (87.7%) 119 (96.0%) 133 (91.7%) 485 (89.2%)
Registered prior submission
 Absolute (%) 11 (64.7%) 30 (71.4%) 62 (76.5%) 84 (90.3%) 112 (94.1%) 125 (94.0%) 424 (87.4%)
 Days, Mean (SD) 45 (45) 67 (77) 78 (110) 87 (131) 101 (107) 110 (129) 94 (117)
 Days, Median (IQR) 22 (7–85) 43 (13–71) 36 (11–93) 29 (8–114) 71 (28–127) 62 (22–152) 49 (15–120)
Submission to first peer-review
 Days, Mean (SD) 28 (13) 35 (24) 32 (16) 35 (20) 55 (55) 75 (65) 50 (48)
 Days, Median (IQR) 29 (19–42) 32 (22–41) 29 (21–41) 32 (20–46) 39 (23–70) 52 (31–95) 36 (22–57)
Submission to acceptance
 Days, Mean (SD) 74 (42) 77 (44) 82 (55) 91 (44) 109 (52) 165 (85) 111 (69)
 Days, Median (IQR) 61 (46–105) 77 (51–95) 75 (46–105) 80 (56–117) 103 (72–138) 142 (103–214) 98 (64–139)
Submission to publication
 Days, Mean (SD) 91 (43) 101 (46) 99 (55) 110 (47) 124 (54) 180 (87) 128 (70)
 Days, Median (IQR) 86 (59–127) 99 (73–118) 91 (64–120) 101 (74–136) 118 (84–148) 158 (117–222) 113 (82–155)
Acceptance to publication
 Days, Mean (SD) 17 (21) 24 (32) 18 (10) 18 (12) 14 (7) 16 (11) 17 (15)
 Days, Median (IQR) 12 (0–22) 15 (11–20) 16 (11–21) 16 (11–21) 13 (9–17) 12 (9–19) 14 (9–19)
Number of reviewers
 Mean (SD) 0.9 (0.6) 1.1 (0.5) 1.1 (0.6) 1.4 (0.8) 1.1 (0.6) 1.7 (0.8) 1.3 (0.7)
 Median (IQR) 1 (1–1) 1 (1–1) 1 (1–1) 1 (1–2) 1 (1–1) 2 (1–2) 1 (1–2)
Number of revisions
 Mean (SD) 0.9 (0.8) 1.0 (0.5) 1.2 (0.7) 1.2 (0.6) 1.0 (0.4) 1.2 (0.5) 1.1 (0.6)
 Median (IQR) 1 (0–1) 1 (1–1) 1 (1–2) 1 (1–2) 1 (1–1) 1 (1–1) 1 (1–1)
Extent of first revision, Absolute (%)
 Major 4 (19.1%) 14 (25.0%) 25 (27.2%) 38 (35.9%) 49 (39.5%) 76 (52.4%) 206 (37.9%)
 Minor 11 (52.4%) 34 (60.7%) 52 (56.5%) 55 (51.9%) 63 (50.8%) 57 (39.3%) 272 (50.0%)
 No revision required 1 (4.8%) 3 (5.4%) 6 (6.5%) 2 (1.9%) 3 (2.4%) 7 (4.8%) 22 (4.0%)
 No (open) peer review 5 (23.8%) 4 (7.1%) 8 (8.7%) 10 (9.4%) 8 (6.5%) 4 (2.8%) 40 (7.2%)
 Reviewer report missing 0 (0%) 1 (1.8%) 1 (1.1%) 1 (0.9%) 1 (0.8%) 1 (0.7%) 4 (0.9%)
  1. Abbreviations: SD Standard deviation; IQR Interquartile range