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Practice
Short Report
Epidemiology of occupational hypersensitivity pneumonitis; reports from the SWORD scheme in the UK from 1996 to 2015
  1. C M Barber1,
  2. R E Wiggans1,
  3. M Carder2,
  4. R Agius2
  1. 1 Health and Safety Laboratory, Centre for Workplace Health, Health and Safety Executive, Buxton, UK
  2. 2 Centre for Occupational and Environmental Health, The University of Manchester, Manchester, UK
  1. Correspondence to Dr C M Barber, Health and Safety Laboratory, Centre for Workplace Health, Health and Safety Executive, Harpur Hill, Buxton SK17 9JN, UK; Chris.barber2{at}sth.nhs.uk

Abstract

Objective To estimate the reported incidence of occupational hypersensitivity pneumonitis (OHP) in the UK and to consider whether the pattern of attributed causation has changed over time.

Methods All cases of OHP reported to the SWORD scheme between January 1996 and December 2015 were classified into 1 of 10 categories of the suspected agent. Cases were grouped into four 5-year time periods to examine any changing pattern in incidence or suspected causation. For each time period, the annual incidence was calculated using the estimated number of reported cases and the working population of the UK.

Results Between 1996 and 2015, there were 202 actual cases of OHP reported to SWORD, equating to an estimated 818 cases, when adjusting for the sampling ratio. Over this period, the annual UK incidence was 1.4 per million workers. The mean (SD) age of reported cases was 52 (13) years, and cases were four-times more likely to be men than women. Over the study period, there was a fall in the proportion of cases reported to be due to agricultural exposures (44–12%), and an increase in cases due to metalworking fluids (MWFs, 2–45%).

Conclusions Over the last 20 years, the incidence of OHP in the UK has been ∼1–2 cases per million workers per year. Working with water-based MWFs is now the most commonly suspected causative exposure for OHP cases reported to the SWORD scheme in the UK.

This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/

https://doi.org/10.1136/oemed-2016-103838

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    Footnotes

    • Contributors CMB, MC and RA planned the study. CMB, REW and MC contributed to data collection and analysis. All authors contributed to the writing, revision and approval of the final manuscript.

    • Funding SWORD is supported by the Health and Safety Executive in Great Britain (contract number PRJ500).

    • Competing interests None declared.

    • Provenance and peer review Not commissioned; externally peer reviewed.