Table 4.

Relative risks (RR) by multiplicative model and attributable risks (AR) by addictive model with the expected (E) and observed (O) joint effects of past medical history of pulmonary tuberculosis in occurring lung cancer in smokers of the Seoul Male Cancer Cohort Study^*

^*O, observed; E, expected; NHX, no past medical history of pulmonary tuberculosis; YHX, past medical history of pulmonary tuberculosis; DUR1, duration of smoking ≤ 30 yr; DUR2, duration of smoking ≥ 31 yr; AMT1, amount of daily smoking ≤ 20 cigarettes/day; AMT2, amount of daily smoking ≥ 21 cigarettes/day; TCI1, total cigarette index ≤ 20 pack-years; TCI2, total cigarette index ≥ 21 pack-years; ^†Per 100,000 person-years.