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Table 1 Summary of previously reviewed studies where population attributable risk (PAR) for occupational exposures and asthma either have been presented or derived from published data.

From: Asthma caused by occupational exposures is common – A systematic analysis of estimates of the population-attributable fraction

Type of study Studies Included PAR
   Range Mean Median
Cross-sectional, general population 16* 2%–45% 17% 17.5%
Case-control studies 6 2%–33% 20% 21.5%
Asthma clinical cohorts or case series 6 6%–21% 12% 11.5%
Theoretical or consensus 3 2%–9% 6% 8%
All 31 2%–45% 15.2% 15%
  1. *One study comprised of women only.
  2. One study comprised of men, only.
  3. (summarized from Blanc and Torén, see reference 10).