Table 1 Selected Diesel Exhaust - Related Occupational Studies on Lung Cancer Incidence/Mortality.

Garshick et al. [18](retrospective cohort)

RR = 1.40^a

1.30 - 1.51

Confounding by smoking

Wellmann et al. [19](retrospective cohort)

SMR = 2.18 ^a

1.61 - 2.87

Confounding by smoking

Gustavsson et al. (20] (case-referant)

RR = 1.63^b

1.14 - 2.33

Misclassification bias