Table 2. Interpretation of the Blinding Index (BI) and classifications.
| BI | Interpretation | BI cut-offsa | Classification |
|---|---|---|---|
| −1.00 | All participants mistakenly guess the alternative intervention (incorrect guessing) | BI ≤ − 0.20 | Incorrect |
| 0.00 | Random guessing (ideal blinding) | −0.20 < BI < 0.20 | Random |
| +1.00 | All participants correctly guess their allocation (correct guessing) | BI ≥ 0.20 | Correct |
Notes.
a
Cut-off scores were developed by consensus of authors of Moroz et al. (2013) and should not be interpreted as definitive classifications of blinding effectiveness.
- BI
- Blinding Index