OBJECTIVES To investigate the relation between different types of exposure to noise and a
classic sign of noise induced hearing loss (NIHL), the audiometric notch. METHODS The
study sample had exposure to both continuous and impulse noise and was drawn from a
population of electrical transmission workers. Audiograms, taken as part of a hearing
conservation programme, were read by three clinicians experienced in the assessment of
NIHL. Working independently and using their clinical judgment, they were asked to identify …

Objective This study aims to determine the prevalence of NIHL among rice and flour mill
workers exposed to high decibel noise levels at the workplace. Methods One-hundred and
seven workers exposed to noise from rice and flour mill machinery and 82 age-matched
controls not exposed to noise at the workplace were recruited for the study from the south
Indian state of Tamil Nadu. All the mill workers and the controls were evaluated for their
hearing thresholds by pure-tone audiometry. Results The characteristic bilateral notch in …