Categorised statements about blinding found in the methods section of analysed trials (N=470)
Categories of descriptors | n (%) |
Double-blind | 191 (41) |
Personnel blinded | 75 (16) |
Single-blind | 38 (8.1) |
Patients and personnel blinded | 37 (7.9) |
Outcome assessor blinded | 26 (5.5) |
Data collectors blinded | 19 (4.0) |
Non-blinded personnel | 17 (3.6) |
Patients blinded | 16 (3.4) |
Blinded | 14 (3.0) |
Open label | 8 (1.7) |
Data analysts blinded | 8 (1.7) |
Partially blinded | 3 (0.6) |
Unmasked patients and investigators | 3 (0.6) |
Non-blinded patients | 2 (0.4) |
Blinded interventions | 2 (0.4) |
Triple-blind | 1 (0.2) |
Unmasking information | 1 (0.2) |
Non-masked patients and personnel | 1 (0.2) |
Rater blinded | 1 (0.2) |
Masked assignment | 1 (0.2) |
Masking | 1 (0.2) |
Outcome assessors and data analysts blinded | 1 (0.2) |
Data collector and data analysts blinded | 1 (0.2) |
Data collector and outcome assessor blinded | 1 (0.2) |