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Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
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[ISO 1999:2013 part 1 : Revised probability model for calculating noise-induced hearing loss].

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Summary

The ISO 1999:2013 standard helps calculate permanent threshold shift (PTS) from noise exposure using factors like noise level and age. This aids in distinguishing occupational noise-induced hearing loss from age-related changes.

Keywords:
Expert assessmentInternational standard 1999:2013Noise-induced hearing lossOccupational diseaseStatistical calculation

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Area of Science:

  • Occupational Health
  • Audiology
  • Industrial Hygiene

Background:

  • The International Organization for Standardization (ISO) 1999:2013 provides a method for calculating statistically expected permanent threshold shift (PTS) due to occupational noise exposure.
  • The calculation incorporates noise level (LEX,8h), duration of exposure, gender, and age, based on empirical data from extensive surveys.

Purpose of the Study:

  • To present a modernized graphical representation of hearing threshold shift calculations based on ISO 1999:2013.
  • To provide tools for distinguishing noise-induced hearing loss (NIHL) from age-related hearing loss (ARHL) in occupational settings.
  • To recalculate and visualize audiometric hearing curves for different probability percentiles and demographics.

Main Methods:

  • Utilized the formula from ISO 1999:2013 for calculating permanent threshold shift (PTS).
  • Recalculated hearing threshold curves based on noise exposure parameters (LEX,8h, duration, age, gender).
  • Generated new graphical representations of audiometric data for probabilities ranging from 5% to 95% across specified frequencies (0.5-6 kHz).

Main Results:

  • Presented expanded and modernized graphical representations of hearing threshold curves, separated for men and women.
  • Demonstrated that higher age increases the likelihood of age-related hearing threshold shift masking noise-induced threshold shift.
  • Provided audiometric curves for key frequencies (0.5, 1, 2, 3, 4, 6 kHz) and probability percentiles (5-95%).

Conclusions:

  • ISO 1999:2013 serves as a valuable tool for assessing occupational hearing disability.
  • The updated graphical representations facilitate the comparison of an individual's audiogram with expected noise-induced hearing loss.
  • Distinguishing NIHL from ARHL is crucial for determining the cause of hearing impairment in noise-exposed workers.