To estimate the effect of hearing aid (HA) use on the risk of dementia diagnosis in individuals with incident hearing loss using observational data from the UK Biobank.
Key Findings:
HA users exhibited a higher risk of dementia diagnosis than nonusers (risk ratio: 1.43; 95% CI, 1.08-1.88).
Associations between HA use and dementia diagnosis remained robust across sensitivity analyses (risk ratio: 1.34-1.59).
Adjustment for primary healthcare use significantly decreased the observed effect (risk ratio: 0.77; 95% CI, 0.44-1.33).
The decrease in effect estimates was smaller when including participants with relatively early diagnoses of hearing loss.
Interpretation:
The findings suggest that while HA use is associated with a higher risk of dementia diagnosis, this may be influenced by residual confounding factors related to healthcare use and timing of hearing loss diagnosis.
Limitations:
Observational nature of the study limits causal inference.
Potential residual confounding by healthcare utilization.
Short follow-up period for some participants may affect long-term outcomes.
Conclusion:
While the study indicates a complex relationship between HA use and dementia risk, further research is needed to clarify causal pathways and the impact of healthcare utilization on these associations.
