Table 3. Odds ratio for lung cancer according to the percentage of first-degree relatives with cancer.
| Percentage of cancer in relatives1 | Cases (n = 334) | Controls (n = 578) | OR2 (95% CI) |
|---|---|---|---|
| TOTAL3 | |||
| < 10% | 23 | 31 | 1.15 (0.61 – 2.15) |
| ≥ 10% | 65 | 87 | 1.12 (0.75 – 1.67) |
| SMOKERS3 | |||
| < 10% | 22 | 19 | 1.37 (0.71 – 2.67) |
| ≥ 10% | 57 | 55 | 1.24 (0.81 – 1.90) |
| NONSMOKERS3 | |||
| < 10% | 1 | 12 | 0.44 (0.05 – 3.71) |
| ≥ 10% | 8 | 32 | 1.53 (0.61 – 3.83) |
1
Any cancer in parents and siblings
2
Odds ratio adjusted for gender, age, socioeconomic status (four levels); and smoking (pack-years) for the total group
3
Reference category: no cancer reported among relatives.