Background: Noise-induced hearing loss is the diagnosis that is most frequently reported to the Norwegian Labour Inspection Authority. The objective of this study was to describe the doctors' reports on noise-induced hearing loss and assess the quality of the information.
Material and method: The study is based on reports to the Labour Inspection Authority for the years 2005-09. We grouped the reporting incidence according to industry, gender and age on the basis of Statistics Norway's employment statistics. The reports were compared to data from Statistics Norway's living conditions survey from 2009.
Results: A total of 7,888 reports had been submitted in the study period (2005-2009), 96% of which concerned men. The annual reporting incidence amounted to 66 per 100,000 employees; six and 120 for women and men respectively. The reporting incidence was highest in the age group 55-74 years and for the construction and manufacturing industries. Altogether 52% of the reports pertained to employees who were no longer working in the enterprise where they had been exposed to noise. The proportion of reports pertaining to employees aged under 40 years was lower than the corresponding proportion of those who reported work-related hearing loss in Statistics Norway's living conditions survey from 2009. Occupational health physicians submitted 85% of the reports.
Interpretation: Of those exposed to noise, only a small proportion of women, younger employees and employees in enterprises with no access to occupational health services are captured by the reporting system. The same may apply to employees in industries such as transport and retail trade, but this will require further investigation.