Table 3.
Guesstimate vs. treatment assignment.
| Treatment assignment | Outcome assessors (n = 110) | Physical therapists (n = 110) | Statisticians (n = 110) | |||
|---|---|---|---|---|---|---|
| EA group | Control group | EA group | Control group | EA group | Control group | |
| Guesstimatea | ||||||
| EA group | 0 | 0 | 6 (10.91) | 3 (5.45) | 0 | 0 |
| Control group | 0 | 0 | 0 | 0 | 0 | 0 |
| Don't know | 55 | 55 | 49 (89.09) | 52 (94.55) | 55 | 55 |
| Degree of confidence in responsea | ||||||
| Correct guesstimate | ||||||
| Extremely confident | 0 | 0 | 0 | 0 | 0 | 0 |
| Reasonably confident | 0 | 0 | 0 | 1 | 0 | 0 |
| Slightly confident | 0 | 0 | 6 (10.91) | 2 | 0 | 0 |
| Missing | 55 | 55 | 49 (89.09) | 52 (94.55) | 55 | 55 |
| Incorrect guesstimate | ||||||
| Extremely confident | 0 | 0 | 0 | 0 | 0 | 0 |
| Reasonably confident | 0 | 0 | 0 | 0 | 0 | 0 |
| Slightly confident | 0 | 0 | 0 | 0 | 0 | 0 |
| Missing | 0 | 0 | 0 | 0 | 0 | 0 |
| Blinding indices | ||||||
| James' Blinding Indexb | 1 | 0.959 (0.920, 0.998) | 1 | |||
| Bang Blinding Indexb | ||||||
| EA group | 0 | 0.109 (0.031, 0.187) | 0 | |||
| Control group | 0 | 0.115 (−0.004, 0.114) | 0 | |||
James' Blinding index (BI) assesses overall degree of disagreement between treatment allocation and guess, where a BI < 0.5 represents unblinding.
Bang Blinding index assesses the degree of disagreement in each treatment group, where a BI>0.2 represents unblinding and a BI < -0.2 represents Opposite Guess or ‘Wishful thinking'.
a
Parentheses denote percentages.
b
Parentheses denote 95% confidence interval.