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Hearing loss and task-based noise exposures among agricultural populations.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
書名/作者:	Hearing loss and task-based noise exposures among agricultural populations.
作者:	Humann, Michael Jerome.
面頁冊數:	172 p.
附註:	Source: Dissertation Abstracts International, Volume: 72-09, Section: B, page: 5236.
Contained By:	Dissertation Abstracts International72-09B.
標題:	Health Sciences, Occupational Health and Safety.
標題:	Agriculture, General.
標題:	Health Sciences, Public Health.
ISBN:	9781124742472
摘要、提要註:	Hazardous noise exposures and hearing loss have been documented among farmers and farm workers for many years. However, little is known about the noise exposures during specific agricultural work tasks and their effect on hearing loss. The objective of this dissertation was to assess the effects of specific agricultural tasks on hearing loss and their contribution to total noise exposures.
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3461159

Hearing loss and task-based noise exposures among agricultural populations.
Humann, Michael Jerome.

Hearing loss and task-based noise exposures among agricultural populations. - 172 p.

Source: Dissertation Abstracts International, Volume: 72-09, Section: B, page: 5236.

Thesis (Ph.D.)--The University of Iowa, 2011.

Hazardous noise exposures and hearing loss have been documented among farmers and farm workers for many years. However, little is known about the noise exposures during specific agricultural work tasks and their effect on hearing loss. The objective of this dissertation was to assess the effects of specific agricultural tasks on hearing loss and their contribution to total noise exposures.

ISBN: 9781124742472Subjects--Topical Terms:

475445
Health Sciences, Occupational Health and Safety.

Hearing loss and task-based noise exposures among agricultural populations.
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100 1 $a Humann, Michael Jerome. $3 475443
245 1 0 $a Hearing loss and task-based noise exposures among agricultural populations.
300 $a 172 p.
500 $a Source: Dissertation Abstracts International, Volume: 72-09, Section: B, page: 5236.
500 $a Advisers: Wayne T. Sanderson; Kelley J. Donham.
502 $a Thesis (Ph.D.)--The University of Iowa, 2011.
520 $a Hazardous noise exposures and hearing loss have been documented among farmers and farm workers for many years. However, little is known about the noise exposures during specific agricultural work tasks and their effect on hearing loss. The objective of this dissertation was to assess the effects of specific agricultural tasks on hearing loss and their contribution to total noise exposures.
520 $a Three studies were conducted to accomplish this objective. The first study examined associations between hearing sensitivity among rural residents (nfarmer = 960, nnon-farmers = 608) and self-reported years of participation in 12 agricultural tasks. Logistic regression analysis was used to examine associations between agricultural activities and hearing loss >25dB. Linear regression analysis was used to examine associations between agricultural tasks and mean decibels of hearing loss. The results indicated farmers have greater hearing loss than non-farmers. However years of participation in specific agricultural tasks was poorly associated with hearing loss. This result suggests that self-reported years engaging in specific agricultural activities may be a poor surrogate for true noise exposure.
520 $a In the second study noise exposures (personal dosimetry) and corresponding task data (direct observation) were collected on 18 grain farms, and mean noise exposures (dBA) were calculated for specific agricultural tasks. Noise exposures ranged from 78.6 dBA to 99.0 dBA across all tasks. The noise exposures for each task varied greatly (large standard deviation and maximum exposure) with most of the variability within the farms. Although specific tasks with intense noise exposures were identified, most comparisons of mean noise exposures from one task to another were not statistically different and intense exposures were present for nearly all tasks. Therefore, controlling noise only for those tasks with the greatest mean noise exposures may not completely eliminate hazardous exposures or the hearing loss risk.
520 $a For the third study, estimates of 8-hr time-weighted-average (TWA) noise exposures were calculated using time-at-task observations from one population of farmers and prior dosimeter measured mean task-based noise exposures from an independent population of farmers. Additionally, dosimeter measured daily noise exposures from the independent population of farmers were also analyzed to identify significant determinants of noise exposure. Simple linear regression analysis was used to compare estimated and actual dosimeter-measured 8-hr TWA noise exposures. The noise exposure determinants were identified by conducting multivariable linear mixed-effects regression analysis on the one-minute noise measurements from the dosimeter measured daily noise exposures. The results indicated the estimated and measured 8-hr TWA noise exposures varied considerably. Therefore, the estimates were not considered reliable. Furthermore, task, number of noise sources and work area were found to have a statistically significant association with noise exposure.
520 $a In summary, hearing loss and noise exposures among agricultural populations are complex and cannot be completely explained by examining agricultural tasks only. More detailed evaluations of tasks are needed to increase the understanding of hearing loss and noise exposure in this dynamic work environment.
590 $a School code: 0096.
650 4 $a Health Sciences, Occupational Health and Safety. $3 475445
650 4 $a Agriculture, General. $3 423385
650 4 $a Health Sciences, Public Health. $3 475446
690 $a 0354
690 $a 0473
690 $a 0573
710 2 $a The University of Iowa. $b Occupational and Environmental Health. $3 475444
773 0 $t Dissertation Abstracts International $g 72-09B.
790 1 0 $a Sanderson, Wayne T., $e advisor
790 1 0 $a Donham, Kelley J., $e advisor
790 1 0 $a Sanderson, Wayne T. $e committee member
790 1 0 $a Donham, Kelley J. $e committee member
790 1 0 $a Cavanaugh, Joseph E. $e committee member
790 1 0 $a O'Shaughnessy, Patrick T. $e committee member
790 1 0 $a Peters, Thomas M. $e committee member
790 $a 0096
791 $a Ph.D.
792 $a 2011
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3461159