Occupational Asthma Reference

Zock JP, Brederode D, Heederik D, Between- And Within- Observer Agreement For Expert Judgment Of Peak Flow Graphs From A Working Population, J Occup Environ Med, 1998;40:969-972,

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Known Authors

Dick Heederik, Institute of Risk Assessment Sciences, Utrecht Dick Heederik

Jan-Paul Zock, Municipal Institute of Medical Research, Barcelona, Spain Jan-Paul Zock

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Abstract

Expert judgment of peak flow-time graphs provides an important tool to detect occupational asthma. This technique has mainly been used in clinics to evaluate reversible airflow obstruction and to assess potential work-related patterns. The reproducibility of this technique in an open working population is unknown. Agreement between and within nine experts was studied using peak flow-time graphs of 49 potato-processing workers. All graphs were classified into four categories by the nine experts, while seven experts read ten graphs at two occasions. Thirty-four graphs (69%) were classified as "no airway obstruction" while four graphs (8%) showed "work-related airway obstruction." There was only slight agreement between the nine experts; mean Cohen's kappa (kappa) was 0.19. Agreement within experts was moderate; mean kappa was 0.47 for judging graphs twice. Our results suggest that in a "healthy" working population, judgment of peak flow graphs is not a favorable method for detection of airway obstruction. If this technique is applied in epidemiological studies, judgment of the graphs should be done by more than one expert

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