|  |  | Proportion of smoking history | ||
---|---|---|---|---|---|
 |  |  | None | 1-49% | 50% |
Gender/Race | No. of cases | Adjusted | RR | RR (CI) | RR (CI) |
Both/Both | 642 | Noa | 1.00 | 0.86 (0.62-1.18) | 0.49 (0.37-0.63) |
 |  | Age, race and genderb | 1.00 | 0.81 (0.59-1.12) | 0.63 (0.48-0.82) |
 |  | Age, race, gender and othersc | 1.00 | 0.86 (0.59-1.24) | 0.89 (0.65-1.22) |