Factors Affecting Early Progress of Cochlear Implant Outcomes in Adults

Inclusion Criteria: * Adult subjects, 18 years or older * Subjects unilaterally implanted or bilaterally implanted with at least 6 months separating the two cochlear implantations. * Subjects who have been implanted between January 2016 and December 2021. * Subjects have received a Nucleus CI: CI512, CI522 or CI532 cochlear implants with non-rotating magnet, or CI600 series equivalent CI612, CI622 and CI632 with rotating magnet and external sound processors CP900 or CP1000 behind-the-ear, or Kanso or Kanso 2 off-the-ear types. * Subjects who are fluent in French (language used in the questionnaire and speech tests) * Subjects who are not opposed to participating in the study * Subjects for who the medical record data is available throughout the defined data search period. Exclusion Criteria: * Subjects with single-sided deafness (SSD). * Subjects who are not affiliated to the French Social Security. * Subjects who are under legal protection.