2.3 Participants
Seven school-aged children with SSD, aged 5 to 15 years (mean, 9 years; standard deviation [SD], 3.65 years), were included in the study. All participants had a pure tone threshold (PTA) ≥90 dB hearing loss (HL) across the standard audiometric frequencies of 250 Hz to 8000 Hz in the impaired ear and normal PTA ≤20 dB from 250 Hz to 8000 Hz in the healthy ear. NH was defined as normal pure tone thresholds of ≤20 dB HL from 250 Hz to 8000 Hz bilaterally. To identify the aetiology and exclude other possible inner ear diseases, all patients underwent imaging examinations, including computed tomography and magnetic resonance imaging before enrolment, and four of them were found with CND.