Reporting of systematic review papers and systematic review authors of different types of COI, stratified by Cochrane (N=100), non-Cochrane (N=94) and overall (N=194)
| Percentages of papers with at least one author reporting the type of COI; N (%) | Distributions of the percentages of authors per paper reporting COI*; median (IQR) | |||||
|---|---|---|---|---|---|---|
| Overall | Cochrane | Non-Cochrane | Overall | Cochrane | Non-Cochrane | |
| Types of COI | ||||||
| At least one type† | 80 (41%) | 49 (49%) | 31 (33%) | 35 (24–62) | 33 (20–50) | 50 (32–67) |
| Individual financial | 60 (31%) | 32 (32%) | 28 (30%) | 35 (20–59) | 29 (20–50) | 42 (27–62) |
| Individual professional | 5 (3%) | 5 (5%) | 0 (0%) | 33 (25–75) | 33 (25–75) | NA |
| Individual intellectual† | 24 (12%) | 19 (19%) | 5 (5%) | 25 (17–50) | 25 (20–50) | 14 (9–47) |
| Institutional financial | 19 (10%) | 7 (7%) | 12 (13%) | 25 (11–29) | 25 (20–25) | 23 (10–29) |
| Institutional advocatory | 7 (4%) | 5 (5%) | 2 (2%) | 20 (9–25) | 22 (18–25) | ‡ |
| ‘Other types’† | 16 (8%) | 12 (12%) | 4 (4%) | 20 (14–25) | 20 (15–25) | 19 (7–25) |
| Provided a ‘loogly statement’† | 29 (15%) | 24 (24%) | 5 (5%) | 33 (23–63) | 42 (21–69) | 29 (19–67) |
*Calculated for systematic review papers with at least one author reporting the type of COI (ie, papers counted in the preceding column).
†p Value for the difference between Cochrane and non-Cochrane systematic reviews is statistically significant.
‡Authors of only two non-Cochrane reviews reported institutional advocatory COI, with the percentages being 5% and 9%.
COI, conflict of interest; NA, not applicable.