Table 5

Associations between categories of cumulative exposure and mortality from selected disease

Trend test p value
Quintiles of cumulative exposureCasesControlsOR95% CIp Value
Silicosis (55 cases)
 ≤1.04 mg/m3 years4401.00<0.001
 1.05–3.64 mg/m3 years5382.020.45 to 9.090.358
 3.65–6.71 mg/m3 years13308.621.86 to 39.950.006
 6.72–10.21 mg/m3 years172712.362.67 to 57.20.001
 >10.21 mg/m3 years162710.552.30 to 48.40.002
Other non-malignant respiratory disease (172 cases)
 ≤0.36 mg/m3 years38921.000.318
 0.37–1.18 mg/m3 years28970.670.37 to 1.190.170
 1.19–2.57 mg/m3 years31940.760.43 to 1.330.331
 2.58–5.41 mg/m3 years28990.680.37 to 1.250.271
 >5.41 mg/m3 years47791.390.76 to 2.540.279
Lung cancer (356 cases)
 ≤0.26 mg/m3 years842411.000.316
 0.26–0.82 mg/m3 years561760.870.56 to 1.290.481
 0.82–2.09 mg/m3 years912061.280.90 to 1.830.170
 2.09–4.10 mg/m3 years741671.290.87 to 1.890.202
 > 4.10 mg/m3 years511510.960.60 to 1.540.880
Kidney cancer (28 cases)
 ≤0.49 mg/m3 years9141.000.967
 0.50–1.42 mg/m3 years3190.220.05 to 1.070.061
 1.43–2.54 mg/m3 years2200.490.16 to 1.520.217
 2.55–4.41 mg/m3 years7161.680.37 to 7.690.505
 >4.41 mg/m3 years7150.900.20 to 3.970.886
Non-malignant kidney disease (32 cases)
 ≤0.68 mg/m3 years7181.000.919
 0.69–1.66 mg/m3 years5200.610.17 to 2.170.446
 1.67–3.19 mg/m3 years7181.040.32 to 3.340.945
 3.20–6.01 mg/m3 years7181.090.26 to 4.520.904
 >6.01 mg/m3 years6190.760.19 to 3.060.704