Disease-specificity in correlations between speech audiometry, hearing-related quality of life, and varying calculation methods for pure tone average in middle ear diseases
摘要
This study examined whether different methods for calculating pure tone average (PTA) yield clinically relevant differences in correlations with speech audiometry and hearing-related quality of life (QoL) in conductive and mixed hearing loss. Additionally, we investigated whether these associations vary among distinct middle ear pathologies: otosclerosis, acute otitis media (AOM) and chronic otitis media (COM).
MethodsIn an ambispective cohort study at a tertiary referral center, 220 ears were analyzed. 194 ears were collected retrospectively. 26 patients were recruited prospectively. Inclusion criteria were adult age, confirmed diagnosis, near-normal bone conduction and conductive hearing loss without prior middle ear surgery. Pure-tone and Freiburg speech audiometry were analyzed along with the SSQ12 questionnaire in prospective patients. Multiple air conduction (AC) and air–bone gap (ABG) - PTA configurations were compared using linear regression and ANCOVA.
ResultsAcross all cohorts, PTA values strongly correlated with speech recognition at 65 dB SPL and with 50% number recognition thresholds (R2 up to 0.77). No clinically relevant differences were found between 4-frequency-PTAs using 3 kHz vs. 4 kHz. However, disease-specific patterns emerged: otosclerosis patients showed consistently poorer word recognition than AOM or COM patients at comparable PTA levels. QoL outcomes correlated significantly with AC-based PTAs but not with ABG-based PTAs or speech results.
ConclusionsPTA calculation methods yield comparable correlations with speech understanding; inclusion of 3 or 4 kHz does not alter results meaningfully. Disease-specific discrepancies underscore the need for nuanced interpretation of PTA–speech relationships and support integrating both PTA and QoL measures in patient assessment. The study was conducted under clinical trial registration number DRKS00037758.