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Prevalence of blinding of individuals involved in trials described as blinded (N=622)
| Individual | Yes, n (%) |
No, n (%) |
Unclear, n (%) |
| Participants | 227 (37) | 46 (7) | 349 (56) |
| Personnel; healthcare providers such as physicians or nurses taking care of a participant | 225 (36) | 55 (9) | 342 (55) |
| Data collectors | 161 (26) | 29 (5) | 432 (69) |
| Outcome assessors | 130 (21) | 21 (3) | 471 (76) |
| Data analysts | 43 (7) | 20 (3) | 559 (90) |
| Manuscript writers | 0 (0) | 16 (3) | 606 (97) |
| Investigators | 104 (17) | 31 (5) | 487 (78) |
