Table 1 Model parameters
From: The cost-effectiveness of Cochlear implants in Swedish adults
| Event | Parameter | Mean value | 95% Confidence interval | Reference |
|---|---|---|---|---|
| Cochlear implant surgery and hearing aid use | Proportion of people deemed eligible for a cochlear implant after initial assessment | 0.56 | 0.048, 0.985 | Expert clinical opinion |
| Death from cochlear implant surgery | 0.00 | – | Assumption | |
| Probability of internal device failure having an implant revision surgery | 1.0 | – | Assumption | |
| Probability a patient elects to discontinue using their cochlear implant | 0.077 | 0.009, 0.206 | [31] | |
| Proportion of people who receive a benefit from using a hearing aid | 0.50 | 0.061, 0.939 | [5] | |
| Proportion of unilateral candidates adopting a hearing aid and are compliant | 0.50 | 0.061, 0.939 | [5] | |
| Device failure | Risk of a cochlear implant internal failure1 | 0.025 | 0.011, 0.040 | [32] |
| Risk of a cochlear implant external (sound processor) failure1 | 0.004 | 0.002, 0.018 | ||
| Six-month probability of internal or external device failure | 0.006 | – | Calculated from [32]. Assumed time to external and internal device failure was similar. | |
| Adverse events | Dysgeusia (taste disturbance) (short term) | 0.065 | – | Weighted average of several papers [33,34,35,36,37,38] |
| Vertigo (short term) | 0.082 | – | ||
| Tinnitus (short term) | 0.039 | – | ||
| Wound infection (short term) | 0.045 | – | ||
| Vertigo (long term) | 0.014 | – | ||
| Device upgrading | Mean lifetime of an acoustic hearing aid | 5 years | 1.3 years, 11 years | [5] |
| Mean time to sound processor upgrade | Every 106 months | 29 months, 232 months | Cochlear Limited |