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SHORT-TERM VARIABILITY OF PURE-TONE THRESHOLDS OBTAINED WITH TDH-39P EARPHONES
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Mar 2014
Source: Int J Audiol. 53(0 2):S5-15. -
Alternative Title:Int J Audiol
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Description:Objective
To estimate the short-term variability and correlates of variability in pure-tone thresholds obtained using audiometric equipment designed for occupational use, and to examine the justification for excluding 8 kHz as a mandatory threshold in occupational hearing conservation programs.
Method
Pure-tone thresholds and other hearing-related tests (e.g., noise dosimetry, otoscopy, middle ear assessment) were conducted with a group of 527 adults between 20 and 69 years of age. A total of five measurement visits were completed by participants within a 14-day period.
Results
The 50 % critical difference boundaries were −5 and 0 dB at 4 kHz and below and −5 and 5 dB at 6 and 8 kHz. The likelihood of spurious notches due to test-retest variability was substantially lower than the likelihood of failing to detect a notched configuration when present. Correlates of variability included stimulus frequency, baseline threshold, acoustic reflectance of the ear, average noise exposure during the previous 8 hours, age, and the tester’s level of education in audiology.
Conclusion
The short-term variability in 8 kHz pure tone thresholds obtained with the TDH-39P earphone was slightly greater than at other frequencies, but this difference was not large enough to justify the disadvantages stemming from the inability to detect a 6 kHz notch.
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Pubmed ID:24564693
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Pubmed Central ID:PMC4668587
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