Table 8. Joint effect on lung cancer risk of smoking (2 strata) and cancer among first-degree relatives (2 strata), by gender and age.
Smoking (pack-years) | Cancer in relatives1 | Cases (n = 334) | Controls (n = 578) | OR2 (95% CI) | |
---|---|---|---|---|---|
GENDER | |||||
Males | 0 – 20 | No3 | 29 | 120 | 1.00 |
Yes | 4 | 29 | 0.50 (0.16 – 1.56) | ||
≥ 21 | No | 148 | 163 | 3.84 (2.39 – 6.16) | |
Yes | 66 | 45 | 5.50 (3.13 – 9.68) | ||
Females | 0 – 20 | No3 | 38 | 130 | 1.00 |
Yes | 11 | 42 | 0.93 (0.43 – 2.04) | ||
≥ 21 | No | 15 | 16 | 3.25 (1.42 – 7.42) | |
Yes | 10 | 7 | 4.89 (1.68 – 14.25) | ||
AGE | |||||
< 60 years | 0 – 20 | No3 | 30 | 122 | 1.00 |
Yes | 7 | 27 | 1.00 (0.39 – 2.56) | ||
≥ 21 | No | 72 | 100 | 3.66 (2.07 – 6.46) | |
Yes | 27 | 24 | 4.96 (2.45 – 10.07) | ||
≥ 60 years | 0 – 20 | No3 | 37 | 128 | 1.00 |
Yes | 8 | 44 | 0.62 (0.27 – 1.45) | ||
≥ 21 | No | 91 | 79 | 3.86 (2.25 – 6.63) | |
Yes | 49 | 28 | 5.74 (2.97 – 11.09) |
Parents and siblings
Odds ratio adjusted for age, gender and socioeconomic status (four levels)
Reference category.