Appendix.
Participant demographics
| Participant | Age (years) | Gender | Implant | Processor | Contralateral Aid | Speech PTA Contralateral Ear (dB HL) | Age of Onset of Hearing Loss (years) | Implantation Age (years) | Cause of Hearing Loss | SES | Income level |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 37 | M | Freedom | Freedom | Yes | No response | 20 | 30 | Progressive as adult | 30 | 4 |
| 2 | 40 | M | Nucleus 24 | CP810 | No | No response | 20 | 32 | Menieres | 30 | 4 |
| 3 | 30 | F | Nucleus 24 | Freedom | No | No response | 0 | 21 | Congenital | 30 | 4 |
| 4 | 31 | M | Freedom | CP810 | Bilateral CI | No response | 3 | 23 | Progressive as child | 42 | 4 |
| 5 | 29 | M | Freedom | CP810 | No | No response | 3 | 25 | Progressive as child | 9 | 4 |
| 6 | 29 | M | Advanced Bionics | AB Harmony | No | 78.3 | 1 | 22 | Ototoxicity as infant | 12 | 1 |
| 7 | 32 | F | Nucleus 22 | Freedom | No | No response | 2.5 | 9.5 | Meningitis & ototoxicity | 30 | 4 |
| 8 | 29 | F | CI512 | CP810 | No | No response | 1.5 | 27 | Meningitis & progressive as child | 36 | 4 |
| 9 | 34 | F | Nucleus 24 | CP810 | No | No response | 0 | 25 | Congenital progressive | 9 | 4 |
| 10 | 18 | F | Cochlear | Unknown | Yes | No response | 3 | 16 | Progressive as child | 12 | 4 |
| 11 | 37 | M | Freedom | Freedom | Bilateral CI | No response | 33 | 33 | Meningitis as adult | 6 | 4 |
| 12 | 54 | M | Nucleus 24 | CP810 | Bilateral CI | No response | 0 | 48 | Congenital progressive | 18 | 3 |
| 13 | 47 | F | Nucleus 24 | Freedom | No | No response | 0 | 37 | Congenital progressive | 9 | 3 |
| 14 | 60 | F | Freedom | Freedom | Bilateral CI | No response | 40 | 54 | Progressive as adult | 18 | 4 |
| 15 | 46 | M | Nucleus 24 | Freedom | Bilateral CI | No response | 18 | 38 | Progressive as adult | 10 | 4 |
| 16 | 62 | M | CI512 | CP810 | No | No response | 14 | 60 | Menieres | 24 | 4 |
| 17 | 52 | F | Freedom | Freedom | Yes | 68.3 | 3 | 48 | Progressive as child | 20 | 4 |
| 18 | 40 | F | Freedom | Freedom | No | No response | 0 | 33 | Congenital progressive | 6 | 3 |
| 19 | 57 | F | CI512 | CP810 | Bilateral CI | No response | 0 | 54 | Congenital progressive | 35 | 3 |
| 20 | 62 | F | Freedom | CP810 | Yes | 76.7 | 13 | 62 | Progressive as adult | 35 | 4 |
| 21 | 62 | F | Freedom | CP810 | Yes | 90 | 13 | 56 | Progressive as adult | 15 | 4 |
Note: PTA: Pure tone average at 0.5, 1, and 2 Hz, with “no response” indicating a PTA ≥ 90 dB HL; SES: Socioeconomic status SES scores (between 1 and 64): product of scores on two eight-point scales; a score of “8” represents the highest occupational status and the highest educational level. Income level for family: (1) less than $20,000 per year; (2) between $20,000 and $30,000; (3) between $30,000 and $45,000; or (4) greater than $45,000