The variability of exposure over time: A prospective longitudinal study
Peretz, C; Goldberg, P; Kahan, E; Grady, S; Goren, A
HERO ID
1060546
Reference Type
Journal Article
Year
1997
Language
English
PMID
| HERO ID | 1060546 |
|---|---|
| In Press | No |
| Year | 1997 |
| Title | The variability of exposure over time: A prospective longitudinal study |
| Authors | Peretz, C; Goldberg, P; Kahan, E; Grady, S; Goren, A |
| Journal | Annals of Occupational Hygiene |
| Volume | 41 |
| Issue | 4 |
| Page Numbers | 485-500 |
| Abstract | Four hundred and forty personal air measurements were carried out on 54 workers, employed in the main processes in six different factories (6-13 in each). Potential exposure was to lead, benzene and dust. Ten randomly repeated hygiene surveys were carried out over 1 year. In order to estimate the magnitude of the variability in workers' exposure over time, its sources, the variance between workers and the variance within a worker, a nested unbalanced analysis-of-variance model was fitted to the log-transformed data. Of the total exposure variance, the within variance of a worker's exposure over time was 51% (geometrical standard deviation, GSD = 3.1) and the between workers, factories and air contaminants variance was 49%. The exposure variance between all the workers was due mainly to variance between workers within the same factory (67%). Outdoor locations, mobility of the worker and mobility of the sources of exposure result in a positive influence on both the variance between (26%, ANOVA) and the variance of a worker over time (39%, regression). These variables are therefore important in the sampling strategy of workers' exposure. For valid compliance testing and assessment of workers' exposure the mean and the within- and between-variance of the workers' exposure over time should be considered. The exposure should be measured several times a year randomly in order to prevent workers misclassification. To assess yearly exposure, a GSD = 3.1 can be used to calculate confidence limits for the arithmetic mean of worker's exposure measurements, in circumstances similar to those in this study. |
| Doi | 10.1016/S0003-4878(97)00008-2 |
| Pmid | 9284649 |
| Wosid | WOS:A1997XV24200008 |
| Url | https://www.proquest.com/scholarly-journals/variability-exposure-over-time-prospective/docview/16100989/se-2?accountid=171501 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Language Text | English |
| Keyword | air sampling; statistical analysis; benzene; factories; Toxicology Abstracts; Pollution Abstracts; Health & Safety Science Abstracts; occupational exposure; hygiene; Air pollution; H 1000:Occupational Safety and Health; P 6000:TOXICOLOGY AND HEALTH; X 24240:Miscellaneous |