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Quality control chart method for analyzing PEF variability in occupational asthma.

Fazel Hayati1, Seed Maghsoodloo, Michael J DeVivo

  • 1Edgewood College, Madison, WI 53711, USA. fhayati@edgewood.edu

American Journal of Industrial Medicine
|January 26, 2008
PubMed
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Quality control charts effectively detect occupational asthma by analyzing peak expiratory flow (PEF) variations. This inexpensive method aids early intervention for workers suspected of work-related asthma.

Area of Science:

  • Occupational Medicine
  • Respiratory Health
  • Statistical Process Control

Background:

  • Occupational asthma is a prevalent respiratory condition in industrialized nations.
  • Identifying work-related asthma is crucial for timely intervention and management.

Purpose of the Study:

  • To evaluate the efficacy of quality control charts in assessing the work-relatedness of asthma.
  • To utilize peak expiratory flow (PEF) measurements for occupational asthma detection.

Main Methods:

  • PEF measurements were collected from workers suspected of occupational asthma over two weeks (at work and away).
  • Shewhart methods were applied to analyze average PEF quality control charts for each subject.
  • A ratio comparing diurnal PEF variation at work versus away from work was calculated.

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Main Results:

  • Quality control charts effectively identified increased PEF variation linked to workplace exposure.
  • A ratio threshold of 15% yielded 94% sensitivity and 61% specificity in detecting occupational asthma.
  • These performance metrics are comparable or superior to existing methods.

Conclusions:

  • Quality control charts offer an effective, economical tool for early detection of occupational asthma.
  • Further research is recommended to explore quality control charts with other respiratory indices (e.g., FEV-1, RAW) and inflammatory markers (e.g., NO).