RRs were estimated by calculation of odds ratios (ORs) and 95% confidence intervals (CIs) using unconditional logistic regression models. We examined RR of lung cancer in relation to employment history in wood-related occupations and processes and history of woodrelated hobbies, as well as in relation to categories of cumulative wood dust exposure from
individual occupational and hobby-related processes and to all processes combined. Quartiles of cumulative wood dust exposure were calculated based on the distribution of cumulative wood dust exposure among controls.