Sleep characteristics and hearing loss in middle-aged and older adults: The National Health and Nutrition Examination Survey 2015-2018

Background: Population-based evidence linking sleep characteristics with hearing is limited and how the associations change with age remains unknown. We aim to investigate cross-sectional associations between sleep characteristics and hearing by age in a nationally representative sample of U.S. adults. Methods: We included 3,100 participants aged 40 years and older from the National Health and Nutrition Examination Survey 2015-18. Audiometric hearing thresholds at 0.5, 1, 2 and 4 kilohertz were averaged to calculate better-ear pure-tone average (PTA). Sleep questions were self-reported, including sleep duration on weekdays or workdays, snoring, snorting or stopping breathing, trouble sleeping, and daytime sleepiness. Multivariable-adjusted linear regression with an interaction term between sleep characteristic (categorical) and age (continuous in years) was used. Primary models adjusted for demographic and lifestyle factors with additional adjustment for cardiovascular factors in secondary models. Results: There was no association of reported sleep duration with PTA at age 50; however, compared to those reporting 7-8 h of sleep, there was a borderline-significant association at age 60 (<7 h: 1.72 dB, 95 % confidence interval [CI], -0.21, 3.66; >8 h: 1.25 dB, 95 % CI, -0.01, 2.51), and a significant association at age 70 (<7 h: 2.52 dB, 95 % CI, -0.27, 5.31; >8 h: 2.67 dB, 95 % CI, 0.56, 4.79). No consistent associations for other sleep characteristics were found. Conclusions: Long sleep duration is associated with worse hearing among middle-aged and older adults and the association differs by age. Longitudinal evidence is needed to establish temporality and examine changes in hearing associated with sleep characteristics.