Abstract
To assess whether the relationship between hearing and depressive symptoms is present among older adults classified as normal hearing (≤25 dB). Cross-sectional epidemiologic study (Hispanic Community Health Study). US multicentered. Adults ≥50 years old (n = 5,499) with normal hearing or hearing loss (HL). The primary exposure was hearing, defined continuously by the 4-frequency pure-tone average threshold (dB) on audiometry. Hearing was additionally categorized into normal hearing (≤25 dB) and HL (>25 dB). The main outcome was depressive symptoms, measured with the Center for Epidemiologic Studies Depression Scale-10 (CESD-10). Depressive symptoms were defined both continuously and binarily (where CESD-10 ≥10 was categorized as clinically significant depressive symptoms). Multivariable linear, logistic, and generalized additive modeling (GAM) regressions were performed. Among those with normal hearing, the CESD-10 score increased by 1.04 points (95% confidence interval [CI]: 0.70, 1.37) for every 10 dB decrease in hearing, adjusting for age, gender, education, cardiovascular disease, and hearing aid use. Among those with HL, the CESD-10 score increased by 0.62 points (95% CI: 0.23, 1.01) for every 10 dB decrease in hearing, adjusting for the same confounders. Similar findings were noted when the outcome was clinically significant depressive symptoms (adjusted odds ratio: 1.28 [1.14, 1.44] in normal hearing versus 1.26 [1.11, 1.44] in HL). In certain sensitivity analyses, the relationship between hearing and depressive symptoms was significantly stronger among those with normal hearing than in those with HL. The relationship between hearing and clinically significant depressive symptoms is present among older adults with normal hearing (<25 dB). We introduce the term subclinical HL as imperfect hearing that is classically defined as normal (1-25 dB). The relationship between hearing and late life depressive symptoms may be more sensitive than previously recognized.
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