Annals of Occupational and Environmental Medicine

Ok Hyun Kim

2 Articles

Comparison of the Standard Threshold Shift Criteria for Evaluating Hearing Conservation Programs: Chang Sun Sim, Kyoung Sook Jeong, Yu Jung Kim, Na Ri Choy, Choong Ryeol Lee, Hun Lee, Jong Pil Jung, Ok Hyun Kim, Yo Weon Lee, Seung Rim Yang, Sung Soo Oh, Ji Ho Lee; Korean Journal of Occupational and Environmental Medicine 2006;18(3):179-188. Published online September 30, 2006; DOI: https://doi.org/10.35371/kjoem.2006.18.3.179

Abstract PDF: OBJECTIVES
Workers from a factory was selected to compare 8 standard threshold shift criteria with the Korean diagnostic criteria of noise-induced hearing loss for this cohort study.
METHODS
From 1990 to 1999, 491 workers at a manufacturing company with complete record of the hearing test covering the range of 0.5~6 kHz for 10 consecutive years were finally selected. Eight standard threshold shift criteria (15 dB once, NIOSH (1972), 10 dB average 3~4 kHz, OSHA STS, AAOHNS, 15 dB twice, 15 dB 1~4 kHz, OSHA STS twice) along with the Korean standard for diagnosing the noise-induced hearing loss (the average hearing threshold at 0.5, 1 and 2 kHz) were compared to calculate the degree of the threshold shift and the minimum time required to detect the change.
RESULTS
Those workers showing at least one positive shift in the 'once'criteria of NIOSH (1972) were 92.5%; the 'average'criteria of 10 dB average 3~4 kHz were 35.8%; 'twice'criteria of 15 dB twice were 44.4%. The duration from the baseline to the year showing the first positive shift was from 3.2 +/- 3.1 years (NIOSH, 1972) to 6.0 +/- 2.1 years (OSHA STS twice). The percentage of true positive shift ranging from 20.4% (AAO-HNS) to 69.8% (NIOSH, 1972). There were 10 (2%) which met the Korean diagnostic criteria of noise-induced hearing loss.
CONCLUSIONS
Currently the concept of hearing threshold shift in diagnosing the hearing loss was adopted in Korea thus in this study we determined the validity and the effect of the various hearing threshold shift criteria and showed that NIOSH (1972) criteria was the best of all. In the future, hearing data from various manufacturing workers should be compared to thoroughly evaluate the threshold shift criteria and to establish adequate standard for Korean workers.

20 View
1 Download

The Effect of Noise Exposure and Age on the Changes of Group Mean Hearing Threshold Level: Annual Follow-up Studies for Seven Years: Ji Ho Lee, Choong Ryeol Lee, Cheol In Yoo, Seung Rim Yaang, Ok Hyun Kim, Byung Mann Cho, Su Ill Lee, Don Kyoun Kim; Korean Journal of Occupational and Environmental Medicine 1999;11(2):137-152. Published online June 30, 1999; DOI: https://doi.org/10.35371/kjoem.1999.11.2.137

This study was carried out to evaluate the effect of noise exposure and age on the changes of group mean hearing threshold level(HTL) over 7-year period. For this purpose, consecutive annual audiometric tests were performed from 1991 to 1997. among 718 male employees of a metal product manufacturing factory. The subjects were divided four groups as follows according to noise level category(NLC). NLC-I officer, exposed noise level was under 60 dB(A) of time weighted average(TWA) NLC-JI technical assistant or engineer, they exposed to workplace noise occasionally NLC-IJJ worker, exposed noise level was below 85 dB(A) of TWA. wore hearing protection device(earmuff or earplug) NLC-IV worker, exposed noise level was over 85 dB(A) of TWA, wore hearing protection device(earmuff and earplug). The results were as follows 1. The improvement of group mean HTL was continued until the fifth year, showing the peak at the third year. The magnitudes of this learning effect were 1.5 - 4.6 dB. 2. The mean HTL of each age group tended to increase after the third year and the tendency was more prominent at 4000 Hz. 3. In noise exposed group(NLC-II, III, and IV), mean HTL increased from the third year after decreasing, meanwhile, in noise free group(NLC-I). it was few changed for the entire period. Among the noise exposure group, the mean HTL of NLC-IV was lower than that of NLC-III and NLC-IV. 4. After learning effect, the mean increase of HTL in noise free group(NLC-I) was 0.4-1.7 dB that suggests aging effect, and that in noise exposure group(NLC-ll, III, and IV) was 0.9 -4.1 dB that suggests noise effect. 5. Statistical analysis of the general linear model implicated that the effect of age was statistically significant at 500, 3000, 4000 and 6000Hz. and the effect of noise exposure was statistically significant at all frequencies except 6000Hz. However, the age * noise interaction was not significant at all frequencies. From these results, it was concluded that the effect of age and noise exposure seems to affect the mean HTL independently and these two factors contribute to an additive effect for the mean HTL change. Furthermore, more concerns should be needed for hearing conservation of low level exposures without any specific protection.

Citations

Citations to this article as recorded by

For 5-years the Longitudinal Study on the Effect of Noise Exposure and Aging to the Changes of Hearing Threshold Level
Chang Ho Chae, Ja Hyun Kim, Jun Seok Son
Journal of Korean Society of Occupational and Environmental Hygiene.2015; 25(4): 573. CrossRef
Prevalence and Risk Factors of Hearing Loss Using the Korean Working Conditions Survey
Kyoo Sang Kim, Oh Jun Kwon
Korean Journal of Audiology.2012; 16(2): 54. CrossRef
Cohort study for the effect of chronic noise exposure on blood pressure among male workers in Busan, Korea
Ji Ho Lee, Weechang Kang, Seung Rim Yaang, Nari Choy, Choong Ryeol Lee
American Journal of Industrial Medicine.2009; 52(6): 509. CrossRef

25 View
0 Download
3 Crossref

Author index