Evaluation of Different Criteria for Significant Threshold Shift in Occupational Hearing Conservation Programs.
Environmental Noise Consultants, Inc., Raleigh, North Carolina 1992 Dec:67 pages
A comparison was undertaken of six different criteria for determining significant hearing threshold shift. Each criterion was applied to the first eight audiograms for males participating in 15 different industrial hearing conservation programs. Of the different criteria used, the OSHA standard threshold shift (STS) criterion produced the lowest overall percentage of employees tagged as having suffered a threshold shift. The 15-dB SHIFT and NIOSH SHIFT criteria produced the highest percentages. The mean percentages of employees tagged on an annual basis generally were small, less than 10% in referent data bases and 20% or less in the noncontrol data bases. The 15-dB SHIFT and NIOSH SHIFT criteria tagged 37% and 51% of employees in noncontrol data bases on the first test comparison and averaged 14% and 24% of employees even in referent data bases. The purpose of the significant threshold shift criterion was to tag employees with temporary threshold shifts (TTS) before they develop hearing loss. Therefore, the purpose of the threshold shift criterion selected was not to act as a recordable occupational illness but rather to reflect a significant amount of persistent hearing change.
NIOSH-Purchase-Order; Noise-exposure; Hearing-loss; Ear-disorders; Sensory-thresholds; Occupational-exposure; Noise-induced-hearing-loss;
Final Contract Report;
NTIS Accession No.
Environmental Noise Consultants, Inc., Raleigh, North Carolina