Table 2

Descriptors about blinding found in abstracts of analysed trials (N=294 descriptors from 283 abstracts)

Categories of descriptorsn (%)
Double-blind183 (62)
Single-blind25 (8.5)
Blinded personnel22 (7.5)
Blinded20 (6.8)
Outcome assessors blinded14 (4.7)
Open label8 (2.7)
Patient and assessor blinded4 (1.4)
Triple masked3 (1.0)
Blinded intervention application3 (1.0)
Unmasked intervention2 (0.7)
Blinded patients2 (0.7)
Triple-blind2 (0.7)
Patients and personnel blinded2 (0.7)
Clinicians not blinded1 (0.3)
Unblinded assessment1 (0.3)
Blinded monitoring1 (0.3)
Success of patients’ blinding1 (0.3)