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Table 4 Risk of bias for trials within different funding categories and overall

From: Sponsorship bias and quality of randomised controlled trials in veterinary medicine

  Risk of bias Pharmaceutical funding/involvement (86 trials) Non pharmaceutical funding declared (19 trials) No funding source declared (21 trials) All trials (126 trials)
Sequence generation High 3 (3.5%) 0 (0%) 0 (0%) 3 (2.4%)
Low 16 (18.6%) 7 (36.8%) 8 (38.1%) 31 (24.6%)
Unclear 67 (77.9%) 12 (63.2%) 13 (61.9%) 92 (73.0%)
Allocation concealment High 5 (5.8%) 1 (5.3%) 0 (0%) 6 (4.8%)
Low 5 (5.8%) 3 (15.8%) 3 (14.3%) 11 (8.7%)
Unclear 76 (88.4%) 15 (78.9%) 18 (85.7%) 109 (86.5%)
Blinding High 5 (5.8%) 3 (15.8%) 2 (9.5%) 10 (7.9%)
Low 29 (33.7%) 7 (36.8%) 8 (38.1%) 44 (34.9%)
Unclear 52 (60.5%) 9 (47.4%) 11 (52.4%) 72 (57.1%)
Incomplete outcome reporting High 14 (16.3%) 1 (5.3%) 4 (19.0%) 19 (15.1%)
Low 36 (41.9%) 15 (78.9%) 14 (66.7%) 65 (51.6%)
Unclear 36 (41.9%) 3 (15.8%) 3 (14.3%) 42 (33.3%)
Selective outcome reporting High 18 (20.9%) 5 (26.3%) 6 (28.6%) 29 (23.0%)
Low 64 (74.4%) 11 (57.9%) 12 (57.1%) 87 (69.0%)
Unclear 4 (4.7%) 3 (15.8%) 3 (14.3%) 10 (7.9%)
  1. Data expressed as as raw numbers and percentages of total trials