Prevalence, Incidence Proportion, and Heritability for Tinnitus: A Longitudinal Twin Study

Area of Science:

• Auditory Neuroscience
• Genetics
• Longitudinal Studies

Background:

• Tinnitus is a common auditory symptom.
• Understanding its causes, including genetic and environmental factors, is crucial.
• Hearing loss is often associated with tinnitus.

Purpose of the Study:

• To examine the relationship between tinnitus and hearing threshold shifts over 20 years.
• To investigate the genetic contribution to tinnitus in a male twin cohort.
• To test the hypothesis that faster hearing deterioration increases tinnitus risk.

Main Methods:

• Longitudinal analysis of male monozygotic and dizygotic twin pairs (n=1114 at baseline).
• Mixed models for hearing threshold shift comparison, adjusted for age.
• Co-twin analysis and genetic modeling to estimate genetic and environmental influences.

Main Results:

• Tinnitus prevalence increased from 13.5% to 34.4% over two decades.
• New tinnitus cases showed the greatest high-frequency hearing threshold shifts.
• A moderate genetic influence (approx. 40%) for tinnitus was identified, independent of hearing genetics.

Conclusions:

• Faster hearing deterioration is linked to a higher risk of developing tinnitus.
• Genetic factors play a moderate role in tinnitus development.
• Environmental factors also significantly contribute to tinnitus etiology.