Table 1

Estimated geometric means (mg/m3) and temporal trends per campaign for respirable dust and respirable quartz concentrations, (A) overall, (B) per job and (C) mineral produced, adjusted for random effects of site, job and worker

Respirable dustRespirable quartz
Sites (n)Observation (n)GM
2002
GM
2010
GM
2016
Trend
(%)
CI
(95%)
Sites (n)Observation (n)GM
2002
GM
2010
GM
2016
Trend
(%)
CI
(95%)
(A) Countries
All15425 5390.520.240.14−4.6***−4.8 to −4.314922 5930.0120.0090.007−2.1%***−2.3 to −1.8
Original participants13224 2540.520.240.15−4.6%***−4.9 to −4.412721 4180.0120.0090.008−2.1%*** −2.4 to −1.9
Recent participants2212850.400.48+1.6−0.3 to +5.72211750.0100.019+5.6−0.9 to +10.3
(B) Job
Quarry worker7627850.300.08−4.8**−5.5 to −4.37026840.0070.005−1.3**−2.2 to −0.4
Crusher246630.690.31−2.9**−4.1 to −1.7203900.0080.006−1.0−3.0 to +1.0
Miller operator3712620.590.15−4.9***−5.8 to −4.33610900.0270.013−2.8***−4.0 to −2.0
Dry process worker9628650.580.19−3.9***−4.7 to −3.38924210.0200.011−2.1***−3.0 to −1.2
Wet process worker5417430.290.09−4.1***−4.9 to -3.55116570.0100.009−0.3−1.3 to +0.6
Transport worker11740450.400.10−4.7***−5.4 to −4.511136210.0100.005−2.5***−3.2 to −1.8
Bagging worker9532730.880.24−4.4***−5.0 to −4.09228240.0300.013−3.0***−3.8 to −2.3
Foreman9223390.320.07−5.4***−6.1 to −5.08721530.0080.006−1.3*−2.3 to −0.5
Maintenance worker11536080.570.20−3.6***−4.3 to −3.110930740.0140.009−1.7**−3.1 to −1.6
Multiskilled worker7110050.360.13−3.5**−4.7 to −2.4688560.0130.007−2.0**−3.7 to −0.7
Plastification worker41561.160.10−8.4***−10.5 to −7.141560.2800.015−10.1***−12.6 to −8.6
Laboratory worker8117550.380.10−4.6***−5.6 to −4.07616270.0110.008−1.3**−2.3 to −0.3
(C) Mineral
Silica6412 0360.310.09−4.0 ***−4.4 to −3.86411 9880.0130.010−0.9***−1.3 to −0.5
Clay932210.430.09−5.4***−6.0 to −5.1932210.0270.008−4.7***−5.4 to −4.3
Kaolin910370.700.26−3.5**−4.7 to −2.5910340.00580.0060+0.2−1.1 to +1.4
Talc813330.510.30−2.0**−3.1 to −1.051000.00080.0002−5.1−0.9 to +0.7
Mixed minerals1225481.230.15−7.3***−8.2 to −7.01224570.0310.015−2.6***−3.5 to −1.9
Other minerals4042810.750.24−4.0***−4.1 to −3.53827930.0120.004−3.9***−5.0 to −3.0
  • *p<0.05, **p<0.01, ***p<0.001.

  • GM, geometric mean (mg/m3).