An exposure-assessment strategy accounting for within-and between-worker sources of variability.
A strategy is presented for comparing exposures to an occupational exposure limit (OEL) and for suggesting appropriate interventions when exposures are unacceptable.
The exposure-assessment protocol contains five levels.
It is suggested that at least two shift-long measurements be randomly collected from each of 10 workers for preliminary analysis.
If the logged exposure data appear to be appropriate for testing (Level 1), the probability of-overexposure is compared to the pre-determined value via a rigorous test of statistical significance (Level 2).
Based upon published data, this test is likely to classify exposures as acceptable with 20 measurements when the group mean exposure is less than one-fifth of the OEL.
However, if exposure is found to be unacceptable, re-sampling can be considered to increase the power of the test (Level 3).
Otherwise, it is necessary to reduce exposures and then to re-apply the protocol.
If it appears that all persons in the group have essentially the same predicted mean exposures (Level 4), then engineering or administrative controls are recommended.
If, on the other hand, substantial differences appear to exist amongst these predicted mean values, regrouping and/or modifications of tasks and work practices should be considered (Level 5).
Application of the protocol is illustrated with samples of data from four groups of workers exposed to inorganic nickel in the nickel-producing industry.
Mots-clés Pascal : Exposition professionnelle, Homme, Evaluation, Méthode étude, Nickel, Métal lourd, Analyse mathématique, Concentration maximale admissible, Analyse statistique, Prévention, Médecine travail, Dose forte, Lieu travail, Teneur air ambiant, Protocole expérimental
Mots-clés Pascal anglais : Occupational exposure, Human, Evaluation, Investigation method, Nickel, Heavy metal, Mathematical analysis, Maximum permissible concentration, Statistical analysis, Prevention, Occupational medicine, High dose, Work place, Ambient air concentration, Experimental protocol
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 95-0483562
Code Inist : 002B03L01. Création : 01/03/1996.