Association of Cognition and Age-Related Hearing Impairment in the English Longitudinal Study of Ageing.

Importance: Evidence has linked age-related hearing impairment (ARHI) with cognitive decline; however, very few studies (none in the United Kingdom) explore this link in large well-characterized groups of community-dwelling individuals.

Objective: To investigate the link between ARHI and cognitive decline using a cohort of elderly individuals from the United Kingdom and explore untreated hearing loss and social isolation as potential explanations for the observed link.

Design, Setting, and Participants: This cross-sectional analysis of wave 7 (June 2014 through May 2015) of the English Longitudinal Study of Ageing (ELSA) sampled men and women 50 years or older and living in the United Kingdom in a community setting. Those with a diagnosis of dementia, Alzheimer disease, or Parkinson disease or with ear infections and cochlear implants were excluded. Data were analyzed from August 1, 2017, through May 25, 2018.

Main Outcomes and Measures: Memory and executive function as measures of cognitive function and hearing acuity derived from the HearCheck screener device (Siemens).

Results: Of a cohort of 9666 members in wave 7 of ELSA, 7385 were eligible for analysis after applying exclusion criteria (55.1% women; mean [SD] age, 67.4 [9.4] years). Of these, 3056 (41.4%) had mild hearing loss and 755 (10.2%) had severe hearing loss; 834 (11.3%) used a hearing aid; and 7155 (96.9%) were white. Hearing loss had a negative association with cognition; for those with moderate to severe loss, the score on memory assessment was a full 1 point less (-1.00; 95% CI, -1.24 to -0.76), ceteris paribus, relative to those with no hearing loss. However, this association was seen only in the individuals with untreated hearing loss (ie, those who did not use hearing aids) (-1.16; 95% CI, -1.45 to -0.87). Evidence suggests that social isolation acts as a mediating factor.

Conclusions and Relevance: Although hearing loss and cognition are linked, untreated hearing loss drives the association. Social isolation is a mediating factor in the link for those who have untreated hearing loss. Cognitive decline associated with ARHI is probably preventable by early rehabilitation and increased opportunistic screening for the elderly.