Model parameters/variance components | ||||
---|---|---|---|---|
Fixed effects terms | Β* | SE | GMR† | p Value |
Intercept | −4.426 | 0.126 | – | – |
Occupation group‡ | ||||
S1 | Ref. | – | 1.00 | – |
S2 | 0.012 | 0.150 | 1.01 | 0.937 |
S3 | 0.095 | 0.144 | 1.10 | 0.511 |
S4 | 0.050 | 0.189 | 1.05 | 0.792 |
S5 | −0.0004 | 0.155 | 1.00 | 0.998 |
UG1 | 1.194 | 0.153 | 3.30 | <0.0001 |
UG2 | 1.032 | 0.141 | 2.81 | <0.0001 |
UG3 | 1.028 | 0.145 | 2.79 | <0.0001 |
UG4 | 1.041 | 0.136 | 2.83 | <0.0001 |
UG5 | 0.328 | 0.161 | 1.39 | 0.042 |
Year of sampling | ||||
Continuous (median 2011) | −0.064 | 0.037 | 0.94 | 0.083 |
Interaction | ||||
S1:Year | Ref. | – | 1.00 | – |
S2:Year | −0.055 | 0.043 | 0.95 | 0.202 |
S3:Year | 0.056 | 0.046 | 1.06 | 0.219 |
S4:Year | −0.090 | 0.065 | 0.91 | 0.166 |
S5:Year | −0.042 | 0.048 | 0.96 | 0.378 |
UG1:Year | 0.032 | 0.041 | 1.03 | 0.459 |
UG2:Year | −0.032 | 0.039 | 0.97 | 0.414 |
UG3:Year | −0.013 | 0.038 | 0.99 | 0.741 |
UG4:Year | −0.006 | 0.039 | 0.99 | 0.884 |
UG5:Year | −0.075 | 0.047 | 0.93 | 0.109 |
Mineral mined | ||||
Gold | Ref. | – | 1.00 | – |
Nickel | 0.308 | 0.113 | 1.36 | 0.007 |
Iron ore | −0.657 | 0.133 | 0.52 | <0.0001 |
Base metals (Cu-Pb-Zn) | 0.256 | 0.173 | 1.29 | 0.139 |
Other | −0.228 | 0.176 | 0.80 | 0.196 |
Sampling duration | ||||
Continuous—minutes (median 607) | 0.0004 | 0.0001 | 1.00 | <0.0001 |
Null model | Final model | ||||
---|---|---|---|---|---|
Variance components | VC§ | SE | VC§ | SE | Per cent¶ |
Between job | 0.327 | 0.055 | 0.057 | 0.017 | 82 |
Between site | 0.340 | 0.061 | 0.160 | 0.032 | 53 |
Between worker | 0.100 | 0.019 | 0.091 | 0.018 | 10 |
Residual | 1.105 | 0.026 | 1.091 | 0.025 | 1 |
*β for fixed effect derived from the mixed model based on the restricted maximum likelihood method.
†Geometric mean ratio.
‡S1=Management and supervisory; sampling/assay/laboratory; metalworking processing trades; electrical/electronic trades; power plant operators; water treatment plant operators; gas supply service operators; other utility operators. S2=Processing plant operators; fitters (except diesel); construction trades; conveyor belt; motor trades other than mechanics. S3=Mobile plant; final product handling/transport; railway operations; diesel fitters; mechanics; waste disposal equipment operators; material handlers. S4=Drilling and blasting; open cut service. S5=Excavation equipment operators; mobile plant operators; driving. UG1=Underground mining production or development. UG2=Underground drilling and blasting. UG3=Underground loading and transport. UG4=Underground ground or roof support; other underground service. UG5=Underground winding and hoisting operators; underground managers, foremen and professionals.
§Variance component.
¶Percentage of variance explained by fixed effects.