Power calculations for the desired tests. Estimated within participant SDs (SD pre and SD post) with expected difference and the calculated required group size
| Test | SD pre | SD post | Expected difference between the two treatment arms | Minimum required group size |
| (1) HINT | 6.3% | 6.3% | 5% | 26 |
| (2) NCIQ—basic sound perception | 14.4 | 23.5 | 53 | 4 |
| (2) NCIQ | 13.4 | 19.6 | 34 | 6 |
| (2) NCIQ—speech perception | 18.8 | 17.8 | 17 | 20 |
| (2) NCIQ self-esteem | 20.1 | 16.4 | 22 | 13 |
| (2) NCIQ activity | 23.0 | 15.9 | 27 | 10 |
| (2) NCIQ social interactions | 19.8 | 14.5 | 25 | 9 |
| (3) SSQ total | 1.9 | 1.9 | 1.4 | 30 |