Simplified frequency selectivity measure as a potential candidate for hearing screening: changes with masker level and test-retest reliability of self-administered testing.

Objectives: This two-part pilot study investigated the feasibility of using a frequency selectivity measure (T_FS) to develop a novel hearing screening test for cooperative adults. Study 1 determined the optimal masker level, while Study 2 assessed the reliability of a self-administered T_FS test prototype performed at the selected masker level.

Design and study sample: Study 1 (normal hearing, n = 20) examined masker-level effects on T_FS using a manual threshold determination method from an earlier study. Study 2 (normal hearing, n = 21; hearing loss, n = 5) evaluated the reliability of a self-administered T_FS test using a new automated threshold determination procedure.

Results: Moderate masker levels (30-40 dB SPL) were suitable for the T_FS measurements, with 40 dB SPL being optimal. Lower level (20 dB SPL) led to floor effects, while higher level (50 dB SPL) broadened cochlear tuning and reduced T_FS values. The self-administered test demonstrated ±9 dB limit of agreement, with intra-subject absolute mean differences of 1.8-2.7 dB across test frequencies, indicating greater variability compared to the manual method.

Conclusions: The self-administered T_FS test is a candidate for hearing screening, particularly for mild sensorineural hearing loss. However, further research is needed to reduce measurement variability and optimise testing for real-world use.