Odds Ratios for Risk Factors for the Presence of Nodules on Initial CT Scan*.

*Stepwise logistic regression, with OR calculated by gender, presence of emphysema or current age versus 1 year increase in age. For example: OR shows increased age to be a significant risk factor for nodules versus the reference parameter, younger age. Only significant predictors for each category are included.Abbreviations: SN = solid nodule, SSN = sub-solid nodule.