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Longitudinal study of hearing.

A C Davis¹, B Ostri, A Parving

¹MRC Institute of Hearing Research, Nottingham University, UK.

Acta Oto-Laryngologica. Supplementum

|January 1, 1990

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Hearing loss progresses gradually for most people, with rates influenced by age. Longitudinal studies are crucial for understanding hearing impairment progression and planning services.

Area of Science:

Audiology
Gerontology
Epidemiology

Background:

Current understanding of hearing impairment progression and causes relies heavily on cross-sectional studies and rare case reports.
Longitudinal studies are essential for analyzing the aging auditory system and gathering incidence data for hearing healthcare planning.

Purpose of the Study:

To analyze the progression and incidence of hearing impairment using longitudinal data.
To investigate the relationship between age and the rate of hearing deterioration.

Main Methods:

Utilized data from two longitudinal studies in Great Britain and Denmark.
Analyzed hearing impairment progression over periods of 2-8 years in participants aged 40-65.
Employed interpolation of prevalence figures to predict incidence rates.

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Main Results:

Hearing impairment shows continuous, gradual deterioration in the majority (up to 97%) over 2 years, with a median rate of 5-6 dB/decade.
Incidence of bilateral hearing impairment (25+ dBHL) is approximately 1.8% per annum for individuals around age 55.
Age significantly influences deterioration rates: individuals over 55 experience faster decline (up to 9 dB/decade) compared to those under 55 (3 dB/decade).

Conclusions:

Hearing impairment progression is gradual for most, but rates accelerate with age.
Longitudinal data provides valuable insights into hearing loss etiology and incidence.
Further long-term studies are needed to precisely define the age-related hearing deterioration curve.