Table 9

Standardised incidence ratios (SIR)* and 95% CI for lung cancer by cumulative exposure to petroleum coke/spent catalyst, hydrocarbon lubricants, and hydrocarbon solvents/fuels among males from a Canadian petroleum company, 1969–94

Exposure category†Petroleum coke/spent catalystHydrocarbon lubricantsHydrocarbon solvents/fuels
SIR (95% CI)SIR (95% CI)SIR (95% CI)
ObservedObservedObserved
*Expected numbers based on cancer incidence rates for the general Canadian population.
†Units for exposure tertiles varies by substance (see tables 6–8 for units).
UnexposedSIR = 0.58SIR = 0.63SIR = 0.72
(0.40 to 0.82)(0.39 to 0.96)(0.43 to 1.14)
Obs = 32Obs = 21Obs = 18
Lowest exposure tertileSIR = 0.71SIR = 0.54
(0.33 to 1.36)(0.22 to 1.11)
Obs = 3Obs = 9Obs = 7
Middle exposure tertileSIR = 0.50SIR = 0.52
(0.16 to 1.16)(0.19 to 1.14)
Obs = 2Obs = 5Obs = 6
Highest exposure tertileSIR = 2.17SIR = 1.13SIR = 0.89
(0.87 to 4.48)(0.52 to 2.15)(0.48 to 1.53)
Obs = 7Obs = 9Obs = 13