Table 4

Prevalence of blinding of individuals involved in trials described as blinded (N=622)

IndividualYes,
n (%)
No,
n (%)
Unclear, n (%)
Participants227 (37)46 (7)349 (56)
Personnel; healthcare providers such as physicians or nurses taking care of a participant225 (36)55 (9)342 (55)
Data collectors161 (26)29 (5)432 (69)
Outcome assessors130 (21)21 (3)471 (76)
Data analysts43 (7)20 (3)559 (90)
Manuscript writers0 (0)16 (3)606 (97)
Investigators104 (17)31 (5)487 (78)