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Table 4 Cross-sectional general population studies published June 1999–2007 where the population attributable risk (PAR) for occupational exposures and asthma was either published or derived.

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

Ref Subject n
Case n
Country Asthma definition Occupational exposure PAR
30 2,974
Canada Adult-onset physician-diagnosed A priori high risk occupations or a report of exposure before onset of asthma 18.2%
31 14,151
976 (ever asthma)
270 (asthma, current job)
France A. Ever asthma attack or dyspnea with wheezing;
B. Adult-onset during or after current job
I. Self-reported exposure to gases, dusts and fumes
II. Job-exposure matrix (excluding jobs with imprecise estimates, n = 10,560)
A., I. 9% A., II 1%*
B., I. 14%
B., II. 7%
Mean 7.8%
US Physician-diagnosed, ever I. Occupations a priori classified at-risk
II. Industries a priori classified at-risk
I. 26.0%
II. 36.5%
Mean 31.3%
34 1,482
U.S. Physician diagnosed, adult-onset I. Self-reported exposure, vapors, gas, dust or fume
II. Job-exposure matrix
III. Both I and II
I. 17%
II. 5%
III. 14%
Mean 12%
35 I.16,646
II. 11,337
U.S. (three states)
U.S. (two states)
Both use self-reported, health professional- diagnosed adult-onset asthma Told by a health care provider that asthma was work-related I.6.0% II.8.1%
Mean 7.0%
36 1,922
Brazil Bronchial hyperresponsiveness and adult-onset asthma symptoms Self-reported exposure, vapors, gas, fumes or humidity 22.9%
37 13,826
South Africa Physician diagnosed asthma, ever Ever regularly exposed to smoke, dust, fumes or strong smells or worked underground in a mine 13.6%
  1. *The PAR% for ever asthma was reported for the entire group and is included here as a conservative value. †PAR% derived from published data