To assess the clinical efficiency, speech perception performance using the HINT sentences was measured in quiet pre-operatively, 3-, 6- and 12-months pos-activation on English speaking participants.

Secondary clinical efficiency outcome is defined as the mean HINT scores from baseline to 12 months post-activation.

Recorded HINT sentences lists were presented to the participant at 60 dB SPL pre-operatively in the best aided hearing conditions, at -, 6- and 12- months. The post-activation assessment was performed in the implanted ear alone with masked controlateral ear. Resultant score is a percentage of words correctly repeated. Possible scores are range from 0% to 100% words correctly repeated. A higher score is better.

To assess the clinical efficiency, speech perception performance using the HINT sentences was measured in noise pre-operatively, 3-, 6- and 12-months pos-activation on English speaking participants.

Secondary clinical efficiency outcome is defined as the mean HINT scores from baseline to 12 months post-activation.

Testing open-set sentence recognition with concurrent background noise present at +10 decibel signal-to-ratio (dB SNR) with signal level presented at 65 dB SPL and noise at 55 dB SPL. Recorded HINT sentences lists were presented to the participant in front pre-operatively in the best aided condition and post-operatively in the implanted ear alone with masked contralateral ear. Speech and noise were colocated (S0N0). Resultant score is a percentage of words correct. Possible scores range from 0% to 100% words correctly repeated. A higher score is better.

Adverse event (AE) is defined as any undesired change from the participant's baseline condition symptom or clinically relevant symptom or disease, regardless of its cause.

AEs include complications that are related to the device or clinical procedure, as well as unrelated AE that are not related to the device or the trial procedure.

AEs were classified as Minor if they corresponded to any of the following criteria:

• adverse event settled spontaneously without surgical procedure (e.g. hematoma)
• adverse event settled spontaneously with conservative medical management

The secondary safety endpoint is the minor related adverse events rate during the surgery and over the post-surgical period from activation to 12 months post-activation.

Race and Ethnicity were not collected from any participant.

Adverse event (AE) is defined as any undesired change from the participant's baseline condition symptom or clinically relevant symptom or disease, regardless of its cause.

AEs include complications that are related to the device or clinical procedure, as well as unrelated AE that are not related to the device or the trial procedure.

AEs were classified as Major if they corresponded to any of the following criteria:

• life-threatening conditions (e.g. meningitis)
• require hospitalization
• result in permanent disability or damage (e.g. facial nerve paresis)
• require revision surgery with or without explantation or re-implantation (e.g. device failure, flap necrosis)
• medical events that could not be alleviated by electrode deactivation (e.g. tinnitus, facial nerve stimulation, pain)

The co-primary safety endpoint is the major related adverse events rate during the surgery and over the post-surgical period from activation to 12 months post-activation.

Safety is reported, on overall participants, in terms of surgical safety (intra-operative major complication rate) and post-surgical safety (major complication rate from the surgery to 12 months post activation to determine the long-term safety profile of the Neuro cochlear implant system).

Clinical benefit is defined as the change of HINT scores post-operatively in the implanted ear only with masked contralateral ear and pre-operatively in the best aided conditions. Clinical benefit is measured in quiet and in noise using the Hearing in Noise Test (HINT).

In quiet, HINT sentences lists were presented to the participant at 60 decibel sound pressure level (dB SPL). In noise, the sentences were presented with concurrent background noise at +10 decibel signal-to-noise-ratio (dB SNR), signal level at 65 dB SPL and noise at 55 dB SPL. Resultant score is a percentage of words correctly repeated, possibly ranged from 0% to 100%.

Clinical benefit is computed for each participant. A positive difference of post- and pre-operative HINT scores is considered clinically significant if it exceeded 10 percentage points (pp). A decrease that exceeded 10 pp is considered a clinically significant decrement. A difference of less than 10 pp was considered as no change in performance.

Clinical benefit is reported on the English-speaking participants.

To assess the clinical efficiency, speech perception performance using the HINT sentences was measured in quiet pre-operatively, 3-, 6- and 12-months pos-activation on English speaking participants.

Secondary clinical efficiency outcome is defined as the mean HINT scores from baseline to 12 months post-activation.

Recorded HINT sentences lists were presented to the participant at 60 dB SPL pre-operatively in the best aided hearing conditions, at -, 6- and 12- months. The post-activation assessment was performed in the implanted ear alone with masked controlateral ear. Resultant score is a percentage of words correctly repeated. Possible scores are range from 0% to 100% words correctly repeated. A higher score is better.

Clinical efficiency is reported on the thirty-three (33) English-speaking participants.

To assess the clinical efficiency, speech perception performance using the HINT sentences was measured in noise pre-operatively, 3-, 6- and 12-months pos-activation on English speaking participants.

Secondary clinical efficiency outcome is defined as the mean HINT scores from baseline to 12 months post-activation.

Testing open-set sentence recognition with concurrent background noise present at +10 decibel signal-to-ratio (dB SNR) with signal level presented at 65 dB SPL and noise at 55 dB SPL. Recorded HINT sentences lists were presented to the participant in front pre-operatively in the best aided condition and post-operatively in the implanted ear alone with masked contralateral ear. Speech and noise were colocated (S0N0). Resultant score is a percentage of words correct. Possible scores range from 0% to 100% words correctly repeated. A higher score is better.

Clinical efficiency is reported on the thirty-three (33) English-speaking participants.

Adverse event (AE) is defined as any undesired change from the participant's baseline condition symptom or clinically relevant symptom or disease, regardless of its cause.

AEs include complications that are related to the device or clinical procedure, as well as unrelated AE that are not related to the device or the trial procedure.

AEs were classified as Minor if they corresponded to any of the following criteria:

• adverse event settled spontaneously without surgical procedure (e.g. hematoma)
• adverse event settled spontaneously with conservative medical management

The secondary safety endpoint is the minor related adverse events rate during the surgery and over the post-surgical period from activation to 12 months post-activation.

Safety is reported, on overall participants, in terms of surgical safety (intra-operative minor complication rate) and post-surgical safety (minor complication rate from the surgery to 12 months post activation to determine the long-term safety profile of the Neuro cochlear implant system).