Descriptors about blinding found in abstracts of analysed trials (N=294 descriptors from 283 abstracts)
| Categories of descriptors | n (%) |
| Double-blind | 183 (62) |
| Single-blind | 25 (8.5) |
| Blinded personnel | 22 (7.5) |
| Blinded | 20 (6.8) |
| Outcome assessors blinded | 14 (4.7) |
| Open label | 8 (2.7) |
| Patient and assessor blinded | 4 (1.4) |
| Triple masked | 3 (1.0) |
| Blinded intervention application | 3 (1.0) |
| Unmasked intervention | 2 (0.7) |
| Blinded patients | 2 (0.7) |
| Triple-blind | 2 (0.7) |
| Patients and personnel blinded | 2 (0.7) |
| Clinicians not blinded | 1 (0.3) |
| Unblinded assessment | 1 (0.3) |
| Blinded monitoring | 1 (0.3) |
| Success of patients’ blinding | 1 (0.3) |