Table 3.

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)