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Occupational noise exposure and tinnitus: the HUNT Study
Ina Molaug1, Lisa Aarhus1, Ingrid Sivesind Mehlum1,2
1Department of Occupational Medicine and Epidemiology, The National Institute of Occupational Health in Norway, Oslo, Norway.
Objective:
We aimed to assess the association between occupational noise exposure and tinnitus. Further, to assess whether the association depends on hearing status.
Design:
In this cross-sectional study, tinnitus (>1 h daily) was regressed on job exposure matrix (JEM)-based or self-reported occupational noise exposure, adjusted for confounders.
Study Sample:
The 14,945 participants (42% men, 20-59 years) attended a population-based study in Norway (HUNT4, 2017-2019).
Results:
JEM-based noise exposure, assessed as equivalent continuous sound level normalised to 8-h working days (LEX 8 h), over the working career or as minimum 5 years ≥85 dB) was not associated with tinnitus. Years of exposure ≥80 dB (minimum one) was not associated with tinnitus. Self-reported high noise exposure (>15 h weekly ≥5 years) was associated with tinnitus overall and among persons with elevated hearing thresholds (prevalence ratio (PR) 1.3, 1.0-1.7), however not statistically significantly among persons with normal thresholds (PR 1.1, 0.8-1.5).
Conclusions:
Our large study showed no association between JEM-based noise exposure and tinnitus. This may to some extent reflect successful use of hearing protection. High self-reported noise exposure was associated with tinnitus, but not among normal hearing persons. This supports that noise-induced tinnitus to a large extent depends on audiometric hearing loss.
